<p>The (military spec.) reservoir is designed for extreme environments. The 0.4 mm thick Thermo Polyurethane (TPU) is twice as thick as the standard consumer model. Fully reversible for easy cleaning/drying. A wide Slide-Seal™ top makes it easy to fill and ensures a leak-proof seal. The Hydrofusion™ tube is durable and lightweight with built-in foam insulation. This construction helps keep your liquid cooler, even at the highest temperatures.</p><p>Surge™ Bite Valve naturally ergonomic design with twist on/off function including protective cap.&nbsp;</p><p>With the Plug-N-Play™ connection system, you can easily detach the drinking tube (an automatic shut-off valve prevents leaks) and remove the reservoir from your backpack for convenient refilling, while the drinking tube stays in place.</p><div><br></div>