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GeigerRig's BPA-free 1.5 Liter Hydration Engine features their innovative pressurizing system that eliminates the need to inefficiently suck water through the drink tube like in conventional hydration designs. To pressurize the bladder, simply pump the included bulb to fill a separate chamber with air. Triple-layer welded seams ensure a leak-free system, especially when under pressure. When you squeeze the bite valve, the water sprays out without needing to actively suck on the valve. The advantage to having the water under pressure is that is allows for you to get more water versus suck systems, plus it provides an easy way to share water. Additional benefits are that you can new spray your face/neck to cool down or to clean wounds - unlike conventional systems.
The entire top of the bladder opens for easier filling and closes with a sturdy slide-top. Cleaning the bladder is easy as well: simply reach into the bladder, turn it inside out and put it on the top shelf of your dishwasher.