Hydration backpack backpack capacity 3 liter pack volume 2 litre application cycling model 2015 materials 210 d nylon 70 d diamond clarus air mesh carrying system air channel suitable for men women chest straps with chest strap adjustable additional fastenings safety light loop carry handle top back length 33 cm back panel pods 2 outside pockets front pocket mesh side pockets internal pockets bike tool compartment special features reflective prin