1.Material: waterproof 600D polyester ripstop 2.S-curved shoulder straps with elastic comb 3.Two roomy main compartments 4.Front pocket with organizers inside for mobile phone, writing implements and other objects 5.Adjustable sternum strap keeps pack from swaying side to side 6.Adjustable waist belt 7.Reinforced handle with web ergo 8.Back panel fully padded with breathable mesh and hollow chamber foam, offering extra comfort Spiral channel for air ventilation 9.CD/MP3 player pocket with exit port for earphone cable 10.Expandable mesh side pockets fit quart bottles 11.Bungee cord on front pocket for attaching extra gear