Introducing the revolutionary patented VYPR Valve, bite-to-drink or twist for full-flow hydration. Easily connect to Mazama's "Aqua Shield" (sold separately) for on-the-go water filtration, refilling your bladder without unpacking. Redefine your hydration experience with ultimate convenience and innovation. Includes in-line quick-connect with auto shut-off and magnetic tube retainer. Overall length is 43".