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Gregory 3D Hydro Reservoir

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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.

Size Chart
 1.5 liter2 liter2 liter (Lumbar)3 liter
Capacity (Standard)50 fl. oz70 fl. oz70 fl. oz100 fl. oz
Capacity (Metric)1.5 liters2.0 liters2.0 liters3.0 liters
Weight (Standard)5.6 oz6.0 oz5.4 oz6.5 oz
Weight (Metric)0.16 kg0.17 kg0.15 kg0.18 kg
Width (Standard)8.5 in8.7 in14 in9.0 in
Width (Metric)21.6 cm22.1 cm35.6 cm22.9 cm
Length (Standard)13.0 in15.0 in8.7 in17.2 in
Length (Metric)33.0 cm38.1 cm22.1 cm43.7 cm
FilmPolyurethane / PolyethylenePolyurethane / PolyethylenePolyurethane / PolyethylenePolyurethane / Polyethylene
Bite valve materialSiliconeSiliconeSiliconeSilicone
Country of OriginMade in the U.S.A. of U.S. and Imported MaterialsMade in the U.S.A. of U.S. and Imported MaterialsMade in the U.S.A. of U.S. and Imported MaterialsMade in the U.S.A. of U.S. and Imported Materials
Product Details


  • 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
3D Hydro Reservoir

3D Hydro Reservoir


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