Marca west Waterproof Travel Camping Hiking Climbing Backpack Cycling Daypacks Mountainering Trekking Bag nylon Material:waterproof high quality nylon,provent the items inside from being wet. Function:large room, about 45L, panel loading main compartment which can be easily put some daily necessities,clothes and sporting goods,one computer layer for laptop,two front zipper pockets to hold small accessories and two side pockets for water bottle or umbrella or any other things Design:lightweight straps design,make you feel much more comfortable;Increase air cushion gasket back and waist,breathable mesh and inner filling soft interlayer sponge,buffer shock absorption,reduce the pressure of body contact area,further enhance with comfort. Folds into zippered inner pocket to fit anywhere,unfolds from pocket to backpack,perfect for every trip.High strength zinc alloy resin zipper. This backpack is perfect for day-to-day use, business trip or occasional travel,mountaineering,hiking,camping,other outdoor activities and great gift for everyone.