The Camelbak Forge Flow Insulated 20oz / 0.6L is the largest bottle of its kind. Besides being the largest Forge Flow, this is also the Forge Flow with the best insulation. Your coffee stays hot up to 8 hours or your drink stays cold for up to 13 hours. The Forge Flow has a convenient Free-Flow locking button. Handy for frequent drinking or letting your tea or coffee cool down. You drink from the Forge Flow using the button on the back of the bottle, this allows you to drink from the Forge Flow with one hand.