There's advantages to carrying the HydraPak Velocity IT 2L Insulated Reservoir on long hikes. The Isobound Insulation technology is constructed with cell foam and a double wall that creates a barrier to slow heat transfer and keep your water refreshing and cool. At the end of the flexible and durable Hydrafusion Tube is the lightweight Comet Bite Valve. It conveniently seals after each sip and can be opened and locked with one hand to prevent leaks when you're not using it. The Plug-N-Play® connect system lets you easily disconnect the drink tube from the reservoir for easy filling. We saved the best feature for last: the reservoir can reverse inside-out for easy cleaning and air drying. Wow.