This waterproof and inflatable dry bag will never let you down! Simply put your personal items in the front water-resistant zip pocket and change of clothing, towel, or snacks in the main watertight zippered section. Be sure to snugly seat the watertight zipper into the casing and blow through the air valve to inflate the backpack. The specialized watertight zippers have a much tighter zip tolerance than a regular zipper, this is normal. Please use the included lubricant for less resistance. The Submersipack Backpack will float, and your items will remain secure and dry. GREAT FOR OUTDOORS, WATER OR SNOW ACTIVITIESThis TPU coated, durable nylon backpack is accessorized with 2 mesh water bottle pockets, D-ring, and looped webbing to attach extra gear. The tough construction protects items from extreme elements such as water and snow. The comfort shoulder straps and back padding are made of air dry closed-cell foam. Organize the inside of the bag with the elasticized inner pocket. The sleek design includes adjustable vertical sternum straps and hip straps that give you room to move freely. Great for fishing, boating, surfing, biking, hiking, paddle boarding, camping, snowmobiling or just walking around town.