osprey hydration pack bladder Hydraulics 2L Backpack Water Reservoir with Bite Valve - BPA-Free, Leakproof with QuickConnect and Slide-Seal Insulate your Osprey Hydraulics Hydration Pack Water Bladder Osprey Hydraulics Best Backpack Water

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fisheries.noaa.gov

Osprey addressed this issue by adding padded straps and an extra compartment to the brain that stuff into an isolated zip pocket when in brain-mode, but that allow for conversion into a ~20 liter backpack when the pocket is unzipped and expanded

It adhered to a minimal design and frame no load lifters in sight but was less compact than other backpacking backpacks in that style

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