Made with premium TPU fabric that's environmentally friendly, non-toxic, 100% waterproof, lightweight, breathable, windproof, wear-resistant, scratch-resistant, and cold-resistant. , Features an easy-access, splash-proof outer zipper pocket with a reflective stripe; the shoulder strap includes reflective stripes and an adjustable sternum buckle; a waist strap provides additional support and relieves pressure , Ergonomic design with comfortable, adjustable padding on the shoulder strap and a breathable mesh back for heat dissipation; the back also features an elastic strap for hanging on luggage handles , Flexible deign with adjustable roll top closure; features detachable 15.6-inch laptop compartment with 2 square pockets and 2 pen pockets , Large 30L capacity offers plenty of space for belongings; ideal for work, school, sports, cycling, hiking, camping, and other outdoor activities