UltrAspire continues to push the envelope with our collapsible bottle. With a 500 mL (16 oz) capacity, the soft bottle features our Infusion Valve(TM) and Red(TM) tube which delivers a high flow. Trim the tube to any preferred length, and the user has hydration that's virtually effortless. BPA-free, Phthalate-free, and PVC-free material. 500 mL soft bottle with an Infusion Valve and 5/16" diameter straw. Fits in the front vest pockets for quick access and hands-free delivery. Infusion Valve(TM) is a push/pull valve that delivers amazing flow. Valve and tubing come standard in UltraRed. Tube can be trimmed to preferred length.