Gregory 3D Hydro Trek 3L

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Quick overview

The first-ever reservoir designed for backpacking, hiking and backcountry basecamps, the Gregory 3D Hydro Trek 3L is quick-drying and ready for adventure.

  • Weight: 0.321 kg
  • Volume: 3L
  • Dimensions: 32x24x8 cm


The versatile Trek model can be used in three different modes.

Backpacking Mode
The unique round shape is designed to fit in any multi-day top loading pack horizontally, secured by the drawstring closure and top compression - keeping your pack load balanced and allowing quick access for mid-day filtration.

Basecamp Mode
Push button water delivery system for when you settle down at camp with included universal hanger.

Day Hiking Mode
Compatible with 3D Hydro enabled packs, featuring the SpeedClip hydration mounting system for cross-over use.


  • 3D QuickDry: Soft-molded 3D design prevents contact between the top and bottom layers when hanging open, dramatically speeding drying time and discouraging bacteria growth
  • QuickDry Hanger: A convenient option for storage or hang drying on or off the trail, integrated into the reservoir itself
  • SpeedClip Mounting System: 3D Hydro enabled Gregory packs feature a one-handed Lock-And-Go linkage between the reservoir hanger and the SpeedClip system mounted inside the packs hydration sleeve
  • Anatomical Fit: 3D form and full-length baffle properly distribute the weight of the reservoir by positioning the water flat against your back for optimal stability and comfort, without adding weight and cylindrical bulk
  • Spine Co-Molded Handle: A comfortable, soft-molded handle makes filling easy and the co-molded baseplate provides full length support for hassle-free insertion and removal from the pack
  • Quick Disconnect: Inline hose quick-disconnect coupling for easy refills without having to un-thread the hose from the shoulder harness
  • DryLock Magnetic Bit Valve: Push button on/off bite valve allows for confident, leak-free storage while traveling  to and from the trail (magnet accessory included)
  • EasyGrip Fill Port: Rubberized fill port opening with integrated hose locator for inline quick-disconnect and screwcap tether