The camelbak ergo hydrolock has been ergonomically designed with a 90 degree bend allowing the big bitetrade valve to be perfectly positioned for drinking with a simple flip the onoff mechanism can be activated or shut off as you need with its simple yet effective design the ergo hydrolock prevents water from leaking out so you benefit from maximum hydration camelbak ergo hydrolock features shut off valve lets you control liquid flow turn on when you need it off when you don39