The Geigerrig Hydration Engine is the most innovative and versatile bladder we tested. With its sleek design and pressurized system, it has (once again) won our Editors' Choice award. It has a variety of uses that no other bladder tested could even compare. The sleek profile is thin and narrow, which allows compatibility with all sorts of Backpacking Backpacks and Running Packs. The bladder offers you the ability to keep it pressurized or unpressurized with a double chamber - one for air, and one for water. When pressurized, it was the easiest to drink from and doubled as a sun shower and a great way to clean off your dog or dirty sports equipment before throwing it into your car. One of our caveats with this system is that when fully pumped, the water does slosh around quite a bit.
With its dishwasher safe technology, this was one of the two bladders that could easily be flipped inside out and cleaned right in the dishwasher! We also found that manual cleaning was easy with a simple brush. All parts were easy to take apart. It is more expensive than most other reservoirs, but not that much, considering its many innovations. It is a little heavy if you decide to carry around the pump. This comes in both the 2L and 3L size. We generally recommend the Hydration Engine 3L for $50, because it is not that much heavier, expensive, or difficult to use. For the best value in a hydration bladder, we recommend the CamelBak Crux Reservoir. If you are mostly backpacking or want to travel light, we recommend the MSR DromLite and the HydraPak Shape-Shift Reservoir respectively.