Backpack Waterman - In Waterin water surf backpack provides hydration while you surf or SUP, with included 2 litre bladder slimline storage also fits food, keys, sunblock, fins, waxcomb etc while keeping weight down backpack and bladder weigh just 650 grams streamline design customised for in surf use unique pat pending chest plate designed for ultimate support eliminating movement while paddling, minimising resistance when duck diving. 4x independent strap adjustors for