These are incredibly valuable for keeping my pack organized. However, I'm not particularly fond of the new fixed cord lock system. I think it adds unnecessary bulk and it's awkward to grab the cord lock from the top and bottom instead of the sides. Also, the sharp edges of the cord lock holes put unnecessary wear on the cord and are causing premature fraying. My older Sea To Summit stuff sacks do not have this issue. The fabric also has permanent creases that aren't present in any of my previous generation Ultra-Sil bags, but maybe that's due to how they were packaged. All that said, these are still the best!

Exceedingly light product. Seems very well built. I tend to be pretty careful with my gear, so I'm reasonably confident these will be tough enough for backcountry backpacking. However, if you anticipate these bags taking any sort of abuse, I would consider going with the Ultra-Sill (not the Ultra-oil Nano). However, time will tell. They're very thin but maybe tougher than they look.

Have bought multiple StS stuff sacks; all in the lightest silnylon; they seem pretty durable for the weight which is incredibly light. I'm currently using some in place of the factory sacks for my sleeping pads b/c the factory ones are just too small. Very happy with my choice.