If having even the best fitting hydro pack still annoys you on a long trail run, the Sense Hydro Set is an ideal alternative. The choice of many top athletes, this innovative solution wraps any size soft flask into the hand, so you don't have to grip it, but also compresses as you drink it. Sold by the pair, with a 250ml flask. It fits in your hands, but you don't have to hold on to it. And hydration is instantly accessible. Incredibly easy to carry, it shrinks while you drink and the hand carry system is all about speed. It wraps around your hand, so your hand can relax, and a light squeeze gives you instant hydration. Material: Mesh.