Adventure Medical Ultralight/Watertight .5 First Aid Kit [0125-0392]Ultralight Watertight . 5 First Aid Kit Travel light and fast with the Ultralight Watertight . 5, which weighs only 3. 6 oz. With enough first aid supplies for a pair of adventurers heading out for 1 2 days, this 100% waterproof kit is packed with first aid supplies to clean and bandage wounds, treat muscle aches, dress blisters, and treat other common outdoor injuries. Ideal for ultralight hiking, kayaking, climbing, skiing, and mountain biking.