Feature:1. Waterproof guarantee, the sturdy roll‑top closure system provides a safe waterproof tight to keep your equipment dry in any damp condition where the bag is not completely submerged.2. Light weight, rolled up for storage and easy to carry,5L capacity storage bag is moderate in size, suitable for protecting small objects such as wallets, keys, towels, glasses, compasses, etc.3. Easy to operate and clean, just put your equipment in the bag, grab the top braid and roll it down 3 to 5 times, then plug the buckle to complete the seal.4. Equipped with a water outlet, used to treat the water and air in the bag, reduce weight, facilitate travel, and is also very suitable for short trips, travel and packing small items.5. Wide application range, used for outdoor activities, mountain climbing, camping, hiking, cycling, boating, kayaking, paddling, sailing, canoeing, surfing.How to Use:Step 1: Put the items in the bag, grab the black strap on the top of the bag and align the ends of the strap.Step 2: Roll down the top of the bag 3 to 5 times until you feel the air remaining in the bag is suitable; the tighter the roll, the better the waterproof performance.Step 3: Connect the buckle to complete the tight; the buckle and the strap form a natural handle.Operation steps of aerating and filling water:1. Align the water outlet with the product position;2. Connect the water&