This hiking backpack is made of thicker, water and tear resistant nylon material. With high quality breathable mesh and sponge on back panel, making it a comfortable bag for hiker and keep back cool. It's have one main pocket 40L and compartment, one front up pocket, on bottom zippered shoes pocket and two mesh side pockets. With 5 pocket and 1 compartment all add up to quite a bit of capacity that's easy organized. There's adjustable buckle on top shoulder straps, which make it easy for releasing pressure and more comfortable. 19 5/16" x 9 13/16" x 5 7/8"