The ease of use of a hydration pack, without actually having a hydration pack on your back. That was the idea behind the AutoClose valve on BBB‚ s new AutoTank water bottle. Grab it and drink from it, as simple as that. The AutoClose works similar to a valve on a hydration bladder. It lets water through when you want it to and is always ready for another thirsty sip. Yet it prevents any spills or drips when it‚ s rattling along in your frame.