Gregory  3D Hydro Reservoir - 3 Liters

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Thanks to its soft molded 3D design, the 3-liter Gregory 3D Hydro Reservoir works like a reservoir and dries like a bottle. Its generous capacity and convenient features make it a go-to on the trail.


  • Soft-molded 3D design prevents contact between top and bottom layers when hanging open, dramatically speeding drying time and discouraging bacteria growth
  • QuickDry hanger offers a convenient option for storage or hang drying on or off the trail, integrated into the reservoir itself
  • Crescent handle is designed to work with the Gregory SpeedClip attachment system for a one-handed lock-and-go linkage system
  • 3D form and full-length baffle distribute the weight of the reservoir by positioning the water flat against your back for optimal stability and comfort
  • A soft-molded handle on the spine makes filling easy and the co-molded baseplate provides full length support for hassle-free insertion and removal from the pack
  • Inline hose quick-disconnect coupling makes for easy refills without having to unthread the hose from the shoulder harness
  • Push-button on/off bite valve allows for confident, leak-free storage while traveling to and from the trail (magnet accessory included)
  • Rubberized fill port opening with integrated hose locator features inline quick-disconnect and screwcap tether


View all Gregory Reservoirs

Technical Specs

Item #168659
Best Use


Liquid Capacity (L)

3 liters

Liquid Capacity (fl. oz.)

100 fluid ounces

Bite Valve Shut-off Switch


Quick Disconnect Tubing





17 x 7 x 3 inches

BPA Free



7 ounces

270 reviews with an average rating of 4.2 out of 5 stars

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