The Ultralight / Watertight Series features proprietary DryFlex? bags for the ultimate in ultralight, waterproof storage. For the multi-sport athlete that refuses to be let down or weighed down by his or her gear. The Ultralight / Watertight .7 is designed for adventure racers, multi-sport enthusiasts, and anyone looking for an ultralight kit with enough supplies for two people up to four days. Inner DryFlex? waterproof liners and seam-sealed outer silnylon bags provide multiple layers of protection from the elements. Designed for one to four people on trips up to four days, this is the kit for adventures where exposure to the elements will be an issue.