The Sea to Summit Ultra-Sil Dry Sack won the sought after Backpacker Editors' Choice award in 2006 and is still the ideal dry sack available for backpacking. Made with lightweight, waterproof 30D Ultra-Sil CORDURA brand fabric it's the perfect choice for modular packing to organize your gear inside your backpack like a pro. With an almost translucent look, visibility of contents is easy, and if you're really organized you'll make use of multiple color options to find things easier. Other features include a non-wicking Hypalon Roll-top closure, a round base for ease of packing and fully seam sealed for water resistance. An excellent choice for lightweight backpacking, cycle touring and travel.
The Sea to Summit Ultra-Sil Dry Sack won the sought after Backpacker Editors' Choice award in 2006 and is still the ideal dry sack available for backpacking. Made with lightweight, waterproof 30D Ultra-Sil CORDURA brand fabric it's the perfect choice for modular packing to organize your gear inside your backpack like a pro. With an almost translucent look, visibility of contents is easy, and if you're really organized you'll make use of multiple color options to find things easier. Other features include a non-wicking Hypalon Roll-top closure, a round base for ease of packing and fully seam sealed for water resistance. An excellent choice for lightweight backpacking, cycle touring and travel.
The Sea to Summit Ultra-Sil Dry Sack won the sought after Backpacker Editors' Choice award in 2006 and is still the ideal dry sack available for backpacking. Made with lightweight, waterproof 30D Ultra-Sil CORDURA brand fabric it's the perfect choice for modular packing to organize your gear inside your backpack like a pro. With an almost translucent look, visibility of contents is easy, and if you're really organized you'll make use of multiple color options to find things easier. Other features include a non-wicking Hypalon Roll-top closure, a round base for ease of packing and fully seam sealed for water resistance. An excellent choice for lightweight backpacking, cycle touring and travel.
The Sea to Summit Ultra-Sil Dry Sack won the sought after Backpacker Editors' Choice award in 2006 and is still the ideal dry sack available for backpacking. Made with lightweight, waterproof 30D Ultra-Sil CORDURA brand fabric it's the perfect choice for modular packing to organize your gear inside your backpack like a pro. With an almost translucent look, visibility of contents is easy, and if you're really organized you'll make use of multiple color options to find things easier. Other features include a non-wicking Hypalon Roll-top closure, a round base for ease of packing and fully seam sealed for water resistance. An excellent choice for lightweight backpacking, cycle touring and travel.
Last updated at 06/01/2026 11:20:54
Sea To Summit - Ultra-sil 4l Dry Sack - Grey
Delivery $14.95
Sea to Summit - Ultra-Sil 4L Dry Sack - Grey
Delivery between 4–12 June $10
originally posted on seatosummitusa.com
It's hard to find a drybag that is both durable and packable. Most durable dry-bags are a thick PVC material; those are great but don't pack down small. This 65L bag manages to be incredibly durable, and rolls up as small as my other 15L dry bags.Everything else about the bag is designed intelligently: great tie downs, oval shape, replaceable buckles. I've owned one for a few years and just bought a second. My first one is barely showing signs of use; I use it at least monthly on a SUP (fits an iSUP pump and carry bag really well, plus any extra clothes and snacks for the paddle)
originally posted on seatosummitusa.com
HEADS UP - this isn't the kindest review courtesy of my lack of sleep. I hope this comes as helpful critique that ensures the future implementation of customer design is the highest quality possible but I'm sure with my current position and short fuse this is going to be a rough read.After 6 nights on this pad I hate this product and cannot stand to take it on the AT or any future adventure. I know y'all put great effort into the engineering but by God this is the worst mat I've ever slept on. I prefer to sleep on the tent floor.The sheer noise it makes was enough to have woken up my fellow campers and the lack of traction on it creates such an uncomfortable balancing act just to stay onboard the mat I felt I was riding a lubed up surfboard on a gliding magic ... MoreHEADS UP - this isn't the kindest review courtesy of my lack of sleep. I hope this comes as helpful critique that ensures the future implementation of customer design is the highest quality possible but I'm sure with my current position and short fuse this is going to be a rough read.After 6 nights on this pad I hate this product and cannot stand to take it on the AT or any future adventure. I know y'all put great effort into the engineering but by God this is the worst mat I've ever slept on. I prefer to sleep on the tent floor.The sheer noise it makes was enough to have woken up my fellow campers and the lack of traction on it creates such an uncomfortable balancing act just to stay onboard the mat I felt I was riding a lubed up surfboard on a gliding magic carpet underneath me (Not the best analogy but bear with me and my lack of any sleep).Suggestions: (a) either impose a full coat of more traction holding fabric along the entire surface or (b) patches/lines of far more tractive force creating material in a pattern throughout the pad.All in all, I regret buying this twice for my wife & I - we both desperately want to return these things but have passed your 60 day return policy as we ordered it while abroad and the biggest regret I have is having to now deal with reselling it on FB Marketplace.I apologize for the rant but it is an honest review and again, I hope it helps with future designs.
originally posted on seatosummitusa.com
Purchased two 2L drybags for my wife and I, to hold our smart phones, wallets, keys etc. We normally store our drybags in the day hatch of our Kayaks. While practicing our rolls, it’s understandable that some water will get into our day hatches. That’s expected. What wasn’t expected was that water got into my drybag, soaking my phone. Jury is still out on whether I’ll be able to get the phone back up and running. If not……$500 gone.After getting home I did a leak test on both bags. Filled them up with water to see if any would leak out. Unfortunately, both leaked like a sieve. These bags are NOT waterproof, as water permeated through the fabric, and not the seams. Totally disappointed with this product. Will not buy another. BTW, these drybags were only purchased 2 ... MorePurchased two 2L drybags for my wife and I, to hold our smart phones, wallets, keys etc. We normally store our drybags in the day hatch of our Kayaks. While practicing our rolls, it’s understandable that some water will get into our day hatches. That’s expected. What wasn’t expected was that water got into my drybag, soaking my phone. Jury is still out on whether I’ll be able to get the phone back up and running. If not……$500 gone.After getting home I did a leak test on both bags. Filled them up with water to see if any would leak out. Unfortunately, both leaked like a sieve. These bags are NOT waterproof, as water permeated through the fabric, and not the seams. Totally disappointed with this product. Will not buy another. BTW, these drybags were only purchased 2 months ago.
| Hand Orientation | Left/Right |
| Season | 4 |
| Sport | Camping & Hiking |
| Included Components | Dry sack |
| Product dimensions | 28.96 x 12.95 x 12.95 cm; 25.51 Grams |
Sea To Summit - Ultra-sil 4l Dry Sack - Grey
Delivery $14.95
Sea to Summit - Ultra-Sil 4L Dry Sack - Grey
Delivery between 4–12 June $10
It's hard to find a drybag that is both durable and packable. Most durable dry-bags are a thick PVC material; those are great but don't pack down small. This 65L bag manages to be incredibly durable, and rolls up as small as my other 15L dry bags.Everything else about the bag is designed intelligently: great tie downs, oval shape, replaceable buckles. I've owned one for a few years and just bought a second. My first one is barely showing signs of use; I use it at least monthly on a SUP (fits an iSUP pump and carry bag really well, plus any extra clothes and snacks for the paddle)
HEADS UP - this isn't the kindest review courtesy of my lack of sleep. I hope this comes as helpful critique that ensures the future implementation of customer design is the highest quality possible but I'm sure with my current position and short fuse this is going to be a rough read.After 6 nights on this pad I hate this product and cannot stand to take it on the AT or any future adventure. I know y'all put great effort into the engineering but by God this is the worst mat I've ever slept on. I prefer to sleep on the tent floor.The sheer noise it makes was enough to have woken up my fellow campers and the lack of traction on it creates such an uncomfortable balancing act just to stay onboard the mat I felt I was riding a lubed up surfboard on a gliding magic ... MoreHEADS UP - this isn't the kindest review courtesy of my lack of sleep. I hope this comes as helpful critique that ensures the future implementation of customer design is the highest quality possible but I'm sure with my current position and short fuse this is going to be a rough read.After 6 nights on this pad I hate this product and cannot stand to take it on the AT or any future adventure. I know y'all put great effort into the engineering but by God this is the worst mat I've ever slept on. I prefer to sleep on the tent floor.The sheer noise it makes was enough to have woken up my fellow campers and the lack of traction on it creates such an uncomfortable balancing act just to stay onboard the mat I felt I was riding a lubed up surfboard on a gliding magic carpet underneath me (Not the best analogy but bear with me and my lack of any sleep).Suggestions: (a) either impose a full coat of more traction holding fabric along the entire surface or (b) patches/lines of far more tractive force creating material in a pattern throughout the pad.All in all, I regret buying this twice for my wife & I - we both desperately want to return these things but have passed your 60 day return policy as we ordered it while abroad and the biggest regret I have is having to now deal with reselling it on FB Marketplace.I apologize for the rant but it is an honest review and again, I hope it helps with future designs.
Purchased two 2L drybags for my wife and I, to hold our smart phones, wallets, keys etc. We normally store our drybags in the day hatch of our Kayaks. While practicing our rolls, it’s understandable that some water will get into our day hatches. That’s expected. What wasn’t expected was that water got into my drybag, soaking my phone. Jury is still out on whether I’ll be able to get the phone back up and running. If not……$500 gone.After getting home I did a leak test on both bags. Filled them up with water to see if any would leak out. Unfortunately, both leaked like a sieve. These bags are NOT waterproof, as water permeated through the fabric, and not the seams. Totally disappointed with this product. Will not buy another. BTW, these drybags were only purchased 2 ... MorePurchased two 2L drybags for my wife and I, to hold our smart phones, wallets, keys etc. We normally store our drybags in the day hatch of our Kayaks. While practicing our rolls, it’s understandable that some water will get into our day hatches. That’s expected. What wasn’t expected was that water got into my drybag, soaking my phone. Jury is still out on whether I’ll be able to get the phone back up and running. If not……$500 gone.After getting home I did a leak test on both bags. Filled them up with water to see if any would leak out. Unfortunately, both leaked like a sieve. These bags are NOT waterproof, as water permeated through the fabric, and not the seams. Totally disappointed with this product. Will not buy another. BTW, these drybags were only purchased 2 months ago.
I have the 20 L and 35 L bags. I used the 35 L bag on top of my rear bike rack for touring/bikepacking on backroads in Scotland. I used the 35 L bag as it still fit on top of the rack. The 20 L would have held my stuff - barely. Having the extra space in the 35 L made packing easier though. Any extra space could be cinched down easily. With the Hypalon side loops I could secure the bag really well to the rack. The roll top closure snapped around my seat post for further stability. The oval profile of the bag made for a degree of stability on the carrier as well. The cloth was light enough for biking and heavy enough to take abuse - spot on. So, what's Sea to Summit's opportunity? Well - more exterior loops would make attaching elastic webbing possible to stuff a ... MoreI have the 20 L and 35 L bags. I used the 35 L bag on top of my rear bike rack for touring/bikepacking on backroads in Scotland. I used the 35 L bag as it still fit on top of the rack. The 20 L would have held my stuff - barely. Having the extra space in the 35 L made packing easier though. Any extra space could be cinched down easily. With the Hypalon side loops I could secure the bag really well to the rack. The roll top closure snapped around my seat post for further stability. The oval profile of the bag made for a degree of stability on the carrier as well. The cloth was light enough for biking and heavy enough to take abuse - spot on. So, what's Sea to Summit's opportunity? Well - more exterior loops would make attaching elastic webbing possible to stuff a jacket without going into packs. Some loops close to the roll top could make it easier to make a dedicated seat post attachment as well. A more squared off profile (rather than oval) with a flat bottom would make racking even better. I see enough of these bags on bikes already, that a dedicated bike model would work great. A volume less than 35 L and more than 20 L would work great (27.5 L I guess). No matter what you use this bag for, it's a superior outdoor product as is.
Is anything completely waterproof? This bag isn't, but it's not bad either.I'm grateful to Sea to Summit for sending me the item at no cost to me in exchange for an honest review of the item. So I decide to put it through some tough testing. I'm really curious about the claim of being "waterproof" that is so prominent on the label.I started with two very tough tests on this bag: I filled the bag full of wadded up paper and some socks, then sealed it up and sunk it in a sink and let it sit overnight. The next morning I checked it out and the paper had beome somewhat wet.The second test I stuffed it completely full of paper and sealed it up agaain. After I put it in the sink, I could squeze air out of it--which tells me if air can get out, then water can probably ... MoreIs anything completely waterproof? This bag isn't, but it's not bad either.I'm grateful to Sea to Summit for sending me the item at no cost to me in exchange for an honest review of the item. So I decide to put it through some tough testing. I'm really curious about the claim of being "waterproof" that is so prominent on the label.I started with two very tough tests on this bag: I filled the bag full of wadded up paper and some socks, then sealed it up and sunk it in a sink and let it sit overnight. The next morning I checked it out and the paper had beome somewhat wet.The second test I stuffed it completely full of paper and sealed it up agaain. After I put it in the sink, I could squeze air out of it--which tells me if air can get out, then water can probably get in. I let it sit for several hours and came back. All of the paper was soaked and there was about a cup of water inside the bag.Maybe I'm expecting too much from the product. Maybe I'm not sealing it properly. Both are possibilities.On the sealing up of the bag: I was disappointed that the instructions were on the reverse side needed to follow them easily. If the instructions were on the other side of the bag, then the picture in the instructions would match the bag as you hold it--but it's not that way. The picture is on the opposite side so you have to look at the picture in the bag and then reverse it in your mind to seal it up right.For a third test, I decided to fill the bag up with water and seal it up, then put it in a large bowl (upside down) and let it sit for 1 hour. I would then see how much water leaked out. If it's going to keep water out, it also needs to keep water in. As I had feared, after one hour there was a good amount of leakage--nearly 1/2 a cup (100 ml) had drained out. Which means it could also drain in.I consider the possiblity that I'm doing it wrong--that's always something to consider! So I watch a few online videos. One recommends putting five to six folds in the top, another recommends putting your gear inside a plastic garbage bag and then putting that bag inside the dry bag. A third video doesn't tell me anything.So for my next test, I stuff with paper again, squeeze the air out, and put six rolls in the top. I toss it in the shower for 15 minutes to simulate a rainstorm. After 15 minutes I pull it out and the paper is wet--not soaked completely, but plainly wet. Certainly "dryer" than if I had put the paper in the shower without the bag at all--but the stuff's still very wet. It's at this point I think to myself that if I had actually paid for this product I'd take it back for a refund.I set up one final test: A bag in a bag. I get a common household garbage bag and stuff it in the dry bag, then stuff the garbage bag with paper. I then tie the garbage bag to stuf in the dry bag, and seal the dry bag as instructed. I then place it in a vessel of water to see how it performs.Immedaitely I find out that there is a good amount of air trapped in the garbage bag that I can't really "press out" easily and it is clumsy to work through. I do my best, but a good amount of air is trapped in the dry bag. I also wonder what happens in the field when I want to get at my gear in the bag and then re-close the bag--does the garbage bag survive being opened and closed multiple times.The final results of this test were that after two hours the inner garbage bag tied up DID keep everything inside of it dry, but the material between the garbabge bag and the dry bag had a good amount of moisture.I did not complete any tests on the strenght of the dry bag, but it does appear to be sturdy and durable. It certainly stands up to basic use without tearing, unlike a garbage bag alone.Good points:1) It collapses down very small and makes for a very nice container for water. I'm pretty good at bushcraft, but it's kind of hard to make a "bucket" out in the field.2) It keeps stuff "mostly dry" -- better than nothing at all.3) It is easy to open and close.4) It is easy to pack and unpack.5) Because air tends to get trapped in the bag, most of the time as regular pack of gear will float in water.6) If a buckle breaks, it can be replaced -- although I not test that feature.Not-so-good points:1) It isn't waterproof.2) It can trap air and become bulky to pack (although this leads to good point #5 above).3) The buckling system of rolling then buckling is awkward and takes up space in the pack.Conclusions:It's better than nothing, and coupled with a secondary bag such as a garbage bag, it can be a useful tool on trips where you expect the peril of extreme water--kayak, canoe, or rainforest hiking. I wouldn't trust it alone to keep gear dry--especially electornics gear. However, I'll use it on such trips because that coupled with a secondary bag is really just about the only hope you have--alternatives are just not available.I'm not saying I wouldn't use it--I am saying that i wouldn't use it by itself and expect it to keep the contents completely dry. It says it's waterproof, but it isn't.PLUS: A number of the reviews here are showing total success in keeping gear dry, and that is consistent with reviews on other websites. There may be tips and tricks that I have missed.
This is a really nice bag: think of a regular lightweight dry bag amped up! First of all, this bag will keep your gear dry, just like all of Sea to Summits other lightweight dry bags.Whereas the heavyweight bags are polyurethane, the bulk of my bags require water resistance, not heavy-duty immersion. This bridges the gap between a "lightweight" bag and that heavy-duty bag. Why is this important? I've found abandoned lightweight bags in the field with holes and rips; this bag is made from a heavier-weight ripstop nylon similar to what you might find on a high-end daypack for hiking. Except that its waterproof, something that my day pack lacks!But more than that, I really appreciate the molle-style lash points to secure this bag to my pack, to my kayak, to whatever ... MoreThis is a really nice bag: think of a regular lightweight dry bag amped up! First of all, this bag will keep your gear dry, just like all of Sea to Summits other lightweight dry bags.Whereas the heavyweight bags are polyurethane, the bulk of my bags require water resistance, not heavy-duty immersion. This bridges the gap between a "lightweight" bag and that heavy-duty bag. Why is this important? I've found abandoned lightweight bags in the field with holes and rips; this bag is made from a heavier-weight ripstop nylon similar to what you might find on a high-end daypack for hiking. Except that its waterproof, something that my day pack lacks!But more than that, I really appreciate the molle-style lash points to secure this bag to my pack, to my kayak, to whatever mounting point I might require.My only wish is that this came in more colors, but maybe my wish will come true in the years to come.You can't go wrong with this well-made bag!
I originally bought some of the 13 liter and 1 20 liter bag for packingon a trip where my bag/luggage would be open to the elements in my truck bed. Find out these work great as organizers for regular packing in a duffle bag. I also camp so I bought another 20l in bright orange for my go to emergency kit In my truck. It will carry my down bag and jacket matches and I other emergency gear.I like that these are light as I have had multiple shoulder surgeries and the straps help me. Looking into packing some of my camping gear in multiple bags so I can have them color coded for different equipment. Thanks sea to summit for done great bags.
Really disappointed in the performance of this "dry bag". I just returned from a 6 day canoe trip (BWCA), and this was the only bag that really didn't hold up! With multiple portages throughout our trip, we carried the bags over various terrain but with minimal abrasion from rocks or the ground. The dry bags made of "500-denier waterproof, polyester PVC" performed great - no issues with any of them. My inexpensive dry bags made of "190D diamond ripstop polyester" did pretty well. I was very surprised to see by the end of the trip, this bag's 420D nylon fabric TPU did not hold up well - the sides did fine, but the black bottom was easily damaged by incidental abrasions with rocks or the ground and developed a small tear and lots of small holes. Really unacceptable ... MoreReally disappointed in the performance of this "dry bag". I just returned from a 6 day canoe trip (BWCA), and this was the only bag that really didn't hold up! With multiple portages throughout our trip, we carried the bags over various terrain but with minimal abrasion from rocks or the ground. The dry bags made of "500-denier waterproof, polyester PVC" performed great - no issues with any of them. My inexpensive dry bags made of "190D diamond ripstop polyester" did pretty well. I was very surprised to see by the end of the trip, this bag's 420D nylon fabric TPU did not hold up well - the sides did fine, but the black bottom was easily damaged by incidental abrasions with rocks or the ground and developed a small tear and lots of small holes. Really unacceptable for a dry bag to of this size and description to not be more durable. The product description says it's "durable, strong and abrasion resistant..." and "...great choice for rugged watersports such as kayaking, canoeing and whitewater rafting" - it's simply NOT. They are lightweight, maybe suitable for lining INSIDE a pack or within a kayak hatch, or for rain protection for bikepacking. They are not suitable for direct exposure to any abrasion, the holes from the slightest abrasion means they may stand up to rain but not any real / consistent exposure. I'm a former rafting guide, kayak trip leader, and have experience in multi-day kayak and canoe camping trips. I expected better from the Sea to Summit brand and am puzzled by all of the positive reviews.
The Big River Dry Bags are perfect for my canoe and kayak trips. SUP's too. They are tough, water tight, durable and the tie down grommets make for a dry secure load. I bought several sizes and like them so much, bought more to give as gifts. Everyone loves them.I also bought several different size Lightweight Dry Sacks, and am just as happy with them. I do a lot of 2- 7 day overnight backpacking trips in Maine, New Hampshire & Vermont. The bags are used constantly.
The Big River are my go to dry bag gear for kayak/canoe camping. I tried another brand to get some perspective and returned it right away. I have several sizes including the 5l, 35l and now 20l. I previously got a 35l clear rubber/plastic one, but the plastic creates friction that makes it hard to slide in the dry hatch. The big river bag is easier to work with. It’s durable and the lashes on the outside are handy for a number of purposes. I’ll probably get another 20l. The 35l fits my sleeping kit contents. The 20l for food and clothing. 5l for flashlight, knife, lighters, toiletries.
| Hand Orientation | Left/Right |
| Season | 4 |
| Sport | Camping & Hiking |
| Included Components | Dry sack |
| Product dimensions | 28.96 x 12.95 x 12.95 cm; 25.51 Grams |
