1. WATERPROOF The dry bag is made of 500D PVC durable waterproof backpack material, which is flexible and durable. The backpack has been fully waterproof tested and the equipment or clothes in the dry bag remain completely dry and in good condition. You can rely on this dry backpack for kayaking, canoeing, drifting, swimming, camping, hiking and other outdoor water sports. With the waterproof dry bag backpack, you can simply take it and enjoy your time outdoors in the wilderness nature. 2. Ergonomic design – the waterproof dry bag backpack has wide, thick shoulder straps and a movable chest strap and a removable waist belt. All straps on the dry bag are extra long and can be adjusted according to personal size and weight. And the orange buckle on the chest strap serves as a whistle in an emergency. The design of 3 separate back air cushions aims to accelerate air cooling and increase comfort and effectively reduce the pressure on your body. 3. 35 L, 55 L, 85 L, more capacity options for your different trips. The 35 litre dry bag is suitable for two to three days on the water. The 55 litre dry bag has more capacity, which can be suitable for packing clothes and equipment, and the 85 litre bag can hold a whole family's travel items for a week. And the backpack is waterproof, so you don't have to worry about the bad weather during your trip. 4. ROLL TOP CLOSURE SYSTEM You just need to roll the top of the dry bag 3 4 turns and fasten the buckles well and strengthen the strip, which is simple and reliable. Now you can go on your adventure as the professional backpack style backpack is waterproof, airtight and dust resistant, ensuring water stays out and keeps your gear and items dry and inside.