Hydrapak Reversible Hydration Bladder Reservoir, 100-Ounce The reservoirs flip completely inside out, making it easy to clean and easy to dry The slide seal system creates a simple-to-use and effective closure Comes with Hydrapak Surge 45 degree angle bite valve for a perfect drinking It has a big bore tubing Comes with a plug-n-play adapter that allows the user to easily disconnect the tube from the reservoir