Paladineer Hiking Backpack Travel Daypack Sports Bag for Camping,Climbing,Mountaineering,Cycling 28L Reinforcement Materials & Zippers: 100% rip-stop nylon; Corded SBS zipper pulls Pocket Design & Organization: Main compartment with hydration/laptop sleeve; Front organization panel is carefully built to manage the traditional little things like pens, wallet and business cards Padded back panel & Shoulder straps: "X" shape air-speed sponge back panel for cushion and support; Adjustable breathable shoulder straps provide the ultimate in high-density comfort Protection & Safety: Integrated rain cover in case of inclement weather; Adjustable sternum strap with integrated whistle for emergencies Versatile & Utility Design: Created to carry necessaries while travelling across the urban landscape; Great choice for school, hiking, climbing, travel, trekking and commute.