Stahlsac's Steel Line of premium bags protect gear from the elements with functional compartments that keep dry items dry and wet gear safely sealed away. The Steel Line will appeal to a broad range of water sport enthusiasts who participate in gear-intensive, outdoor activities. Every detail is engineered for a purpose and key features are carefully refined to maximize the usefulness of the entire bag. The innovative designs and modern styling provide organizational solutions for any time outdoors and near the water. This lightweight and versatile backpack combines practical design, like the laptop compartment, with dynamic features, like a Bonaire-Style" detachable dry bag. Padded adjustable shoulder straps and sturdy grab-handles keep you comfortably charging ahead. Multiple organizational pockets/ features with quick-access zippers. Optional battery power pack in designated compartment. Bag opens flat for total access to content and the wet pocket is a breathable design so wet gear stored for prolonged periods won't get funky" as fast as with completely sealed compartment designs. All zippers are equipped with pull tabs for ease of access and bag is equipped with a strap that allows use with the add-a-bag" feature of the Steel Line Wheeled Bags (see SKU's: STLBS34 and STLBS27). This adjustable strap comes equipped with a squeeze-style" side-release buckle. The Stahlsac Steel Line Backpack Bag measures (H x W x D) 19" x 13" x 8.75" (48.25 cm x 33 cm x 22.23 cm), has a volume of 1,650 cubic inches (27 liters) and weighs 2.4 lbs. (1.1 kg) when empty. Bags are built to last. Exterior of bag is made from 630D nylon with direct water resistant finish (DWR), 80G polyurethane (PU) coating for high water resistance, 420D high density (HD) nylon, DWR finish, 80G PU coated and hypalon and tarpaulin for reinforcement on stress points. Water-resistant and reversed regular zippers are used on outside of the bag. The bags interior is made from 200D polyester with 60G polyurethane (PU) coating.