Hands-free drinking access makes the Ultimate Direction Body Bottle 500s a terrific solution for training sessions or races.The straw works with the push/pull valve for locking and a bite valve on the end to prevent leaking.The Body Bottle II 500s is an easy and ultra light way to carry your drink. Now with a new fully locking push/pull on/off bite vave! BPA-free laminate of polyethylene and ethylene-vinyl acetate. PVC-free. The Body Bottle fits any Ultimate Direction Vest, Vesta, or Belt. When empty, the bottle collapses to a tiny size.