WHY YOU'LL LOVE IT Sure to be the best in hydration on the market, this handheld is ergonomically shaped to fit any runner’s hand and so easy to squeeze. It’s rigid where it needs to be and compresses easily for quick hydration. It also has a flat bottom to provide a solid surface for filling. This incredible flask is designed to be grip-free and lightweight and features double-wall construction to keep fluids cooler, longer.