Paladineer 15L Outdoor Sports Cycling Backpack Sports Bag Hiking Daypack for Travel Climbing Hiking Biking Cycling Material: waterproof and rip-stop nylon, rip-stop polyester lining Safety Consideration: reflective stripe and whistle buckle for safety Thoughtful Design: the adjustable padded shoulder straps and the padded waist straps for comfort Air-Ventilation: breathable and padded air mesh fabric on the back to provide a more comfortable carry Functional Parts: one main compartment with a hydration sleeve, one sub-compartment with an ipad sleeve and a mesh pocket, one helmet net, one pipe or earphone outlet