Storm Technology delivers an element-battling, highly water-resistant and stain-resistant finish on this backpack. Made from 93% polyester and 7% nylon. The soft-lined laptop sleeve holds up to a 16 inch laptop, while the fully expandable main compartment fits all your gear and secondary compartment works as a shoe/laundry pocket. Other design details include secure zip front pockets for essential item storage, side water bottle pocket that fits 32oz. bottle, as well as adjustable, removable UA strap clip on shoulder to prevent duffle bag from falling off when carrying both. Molle webbing for additional attachment points. Strap system guides you to assure straps are adjusted evenly for balanced weight distribution.