Made by the hydration experts HydraPak®, our SoftFlaskTM 500ml is designed to integrate seamlessly with vests and belts, as well as the drop-in side pockets on our Trail Shorts, Half Tights and Tights. Featuring a low-profile, tapered welded bottom and an easy fill 42mm wide mouth for nutrition mixing, this flask is topped off with a locking cap to prevent unwanted spillage and a handy measurement guide, just in case.