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3D Hydro 3L Reservoir

4.415841584158416 out of 5 stars
101 Reviews

Out of Stock

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3D Hydro Reservoir

With a soft molded design, the 3D Hydro offers the benefits of a reservoir, but packs in tech that lets it dry like a bottle for easier cleaning.


  • An adaptable reservoir with bottle-like perks
  • Quick drying, open construction for easier cleaning
  • Speedclip attachment system locks bag in place in your pack
  • Integrated hanger makes for easy hang drying after wash
  • Fill up with stability and ease thanks to spine handle
  • Drylock magnetic bite valve stays in place and easy to access
  • 3D anatomical construction sits flat and comfortably on your back
  • Item #GREZ05M
2L (122cu in), 3L (183cu in)
inline, quick-disconnect
Drylock, magnetic
[2L] 14.25 x 7 x 3in, [3L] 17.25 x 7 x 3in
Claimed Weight
[2L] 6.5oz, [3L] 7oz
Manufacturer Warranty
limited lifetime

Overall Rating

4.5 based on 106 ratings

Review Summary

1 Stars - 9 reviews
2 Stars - 4 reviews
3 Stars - 5 reviews
4 Stars - 9 reviews
5 Stars - 79 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

October 2, 2023

Reliable water transport

Easy to fill, easy to dry out, easy hook & handle maneuvering; threaded opening syncs with water filter pumping

mary g

Originally reviewed on Gregory

5 out of 5 stars

September 21, 2023


Fits perfectly in my Osprey day pack. It’s easy to fill, load in pack, holds more than enough water for long hike in hot weather, easy to remove, and to drain and dry. Very happy with it.

Bill VT

Originally reviewed on Gregory

1 out of 5 stars

September 12, 2023

Sorely disappointed

I really liked this bladder at first, and had success with it for much longer than some of the other reviews on this page. Unfortunately, my bladder succumbed to the same issue that many people are reporting on here. This is an obvious design flaw in the bladder. I took care to treat mine really well, and all of the sudden found myself with two liters of water at the bottom of my pack. Could have done some real damage. I also find it really disappointing that Gregory requires that you pay to ship your equipment to their repairs and warranties shop. Many other outdoor gear companies will provide a shipping label for obvious warranty issues - and this is clearly something that would fall under their warranty.


Originally reviewed on Gregory

1 out of 5 stars

August 13, 2023

I despise this water bladder!

I should have returned it when I had the chance. Instead, I thought I just didn’t screw the lid on well enough and then made countless other excuses each time it failed and leaked all over my pack. Maybe I forgot to close the bite valve… maybe I squished it too much… maybe that’s just condensation… Well, it failed again just recently when I was testing out my backpacking gear and got everything damp, including my camera. Never again will I buy this or any Gregory water bladders!!!


Originally reviewed on Gregory

5 out of 5 stars

August 7, 2023

Best Reservoir Ever

Perfect fit for my Gregory pack, and the most thought out reservoir ever. So many useful features, and cheaper than lesser products, as well. Five stars all the way!!


Originally reviewed on Gregory

1 out of 5 stars

June 2, 2023

Ripped after light use

I bought this 2 years ago and have maybe used it on 10 hikes. Went to refill it today and it had ripped where the cap meets the water bladder. Furious as this is the start of a 4 day hiking trip

Unhappy camper

Originally reviewed on Gregory

5 out of 5 stars

May 7, 2023

Great Product!

Have always used Camelbak products (packs, reservoirs), but have been disappointed lately. After extensive research, I decided to purchase a Gregory pack for a 17 mile Sedona hike. The pack came with a 2.5L reservoir…which is fine for most hikes, but I wanted the 3L for Sedona. I was very happy with it. The size of the reservoir’s opening is generous and allows for easy filling with water & ice. And the location of the quick disconnect junction is absolutely perfect….so easy to access. I appreciated not having to feed the tubing back through the opening when I had to refill. Great product!


Originally reviewed on Gregory

5 out of 5 stars

May 3, 2023

Best one I’ve had yet.

Perfect. Just what I needed. Best in the business. It doesn’t come with the magnet end that clips to the pack strap. You’ll need to buy that separate.


Originally reviewed on Gregory

4 out of 5 stars

April 30, 2023


Great water bladder. Dries quickly and easily. Would get again


Originally reviewed on Gregory

5 out of 5 stars

April 26, 2023

No plastic tasting water!

Best water bladder ever because it doesn't taste like plastic


Originally reviewed on Gregory