With a 2L water bladder,This Backpack aligns your back while gently protecting your muscles.High-quality nylon material and ultra-lightweight design make it more comfortable to drive.For cycling, hiking, running, skiing, mountaineering, hunting, racing and training.There is a big hidden bottom mesh pouches for umbrella, mineral water,coat,anorak,Jacket etc,.A great promo gift for clients who enjoy outdoor sports.Customized with your own logo.