For athletes who prefer the convenience of a hand flask, this comfortable carrying system puts water within reach. The 500ml flask compresses as you drink, and a small external pocket fits a car key or other small essentials. It fits in your hands, but you don't have to hold on to it, the hydration is instantly accessible. Incredibly easy to carry, this shrink while you drink hand carry system is all about easy carrying and speed. It wraps around your hand, so your hand can relax, a light squeeze gives you instant hydration. Material: Mesh, Ripstop.