ultimate direction body bottle 500 w/straw soft hydration flask, body bottle 500 w/straw ultimate direction the ultimate direction body bottle 500s is the easiest and lightest way to carry your fluids. the "s" includes a flexible straw topped with a bite valve. the bottle is designed to store in the shoulder straps of your vest to allow convenient and quick hydration via the easy to reach straw. the straw is 4.2" long from cap to top of the bite valve. this soft hydration flask is now made in taste-free peeva material. no longer will your water taste like plastic! peva is considered to be a healthier alternative to pvc products since it is a non-chlorinated vinyl material. this updated flask redesigned with a new ergonomic shape for more comfort at your shoulder. the body bottle is the easiest and lightest way to carry your fluids. fits any ud vest, vesta. specs: 42mm opening top. straw with bite valve. weight: 1.48 oz. / 42g. volume: 16.9 oz. / 500 ml. 12.25" overall length. materials polyethylene vinyl acetate (bpa-free).