【100% Waterproof Dry Bag】MIER dry pack is made of heavy duty material that is 100% waterproof, scratch proof and durable. Featured with welded seams craftsmanship and roll-top closure design, the dry backpack can keep your gear dry and safe during adventure or tough environment, even can float safely when you drop it in water 【Extra Storage Pockets】 Capacity: 30L. Weight: 2.5lbs. Size: 12”L x 8”Wx18.5”H. 1 large splash-proof pocket on the front of dry back pack can hold your knife, key, ID, flashlight and more, for quick access. 1 padded inner pouch helps to keep your 15.6 inch laptop, wallet and cellphone safe and dry, without water damage concern. Inner laptop pocket size: 10*14 inch 【Comfortable to Carry】An ergonomic padded breathable back panel, cushioned shoulder straps and adjustable sternum chest strap work together to provide carrying comfort, stability and security. 2 side pockets are for water bottle and umbrella. D-rings at shoulder straps can attach other small stuff 【Versatile Dry Sack Backpack】MIER waterproof drysack is multi-use and keeps your gear safe and dry in outdoor activities and daily life, like floating, kayaking, swimming, rafting, boating, fishing, surfing, hiking, camping, climbing, etc. Also, it can be used as an overnight bag, travel bag, day backpack for sports, gym, travel and day trips 【How to Use】You can roll the drybag down several times to the size you need, then click the two buckles on the opening to form a handle, or connect each side buckle of the bag to complete the seal. Finally connect the top buckle and adjust the strap