Quickly connect a drink tube to your HydraPak Seeker or HydraPak water bottle for versatile backcountry use with the Plug-N-Play(TM) cap. Use inside your pack like a hydration reservoir, strap outside like a bottle, or quickly setup a gravity feed at camp. FEATURES: Twist release technology quickly connects / disconnects HydraPak drink tube (not included) Automatic shut-off for leak-proof tube removal 42mm screw cap fits Stash 750ml and Seekers Includes a dirt guard with tether to keep your cap clean SPECS: WEIGHT 17.8 g / .063 oz MATERIALS POM, Stainless Steel