The ultralight/watertight Series features proprietary dry flex 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. From cleaning wounds and dressing blisters to treating muscle aches, pains, and symptoms of allergic reactions, the ultralight/watertight .3 packs a lot of first aid in a little space. Whether you are whitewater kayaking, Mountain biking or hiking, this is your personal kit for single day outings. The re-sealable dry flex watertight bag enables you to carry it in the outside pocket of your PFD where you can get to it quickly, and it remains watertight use after use.