Mountaintop 40l Outdoor Sport Lightweight Backpack Mountaineering Bag Waterproof Daypack for Hiking Climbing Camping Large capacity of 40L,breathable S-type strap,mesk belt,3D carrying system Large front pocket, multiple zippered side pockets, and multiple elastic bands, inside the bag, ther is a laptop compartment Two different fabrics: Quality polyester fabric; Water repellent, Tear resistant, Wear resistant,Breathable and moistureproof, Smooth and Comfortable SBS zipper, YNS buckle-Cold-resistant and Securely; Reflective strip design, higher safety factor for night; Water outlet design, more humane, more convenient for travelling Size: 55cm(H)x35cm(L)*25cm(W)