3D Hydro 3L Reservoir
Size:
Quantity
Only 1 In stock
Why We Like The Gregory 3D Hydro 3L Reservoir
The Gregory 3D Hydro 3L Reservoir is built to be easy to clean and easy to fill, with all the adaptability we need for our biggest adventures. The Hydro is constructed with a soft-molded 3D shape that's self-supporting and prevents the bottom and top layers from folding in on themselves, which promotes a faster dry time and limits odor buildup. A full-length baffle along the interior of the bladder discourages the reservoir from sloshing around as we hike or bike. Meanwhile, the crescent-shaped handgrip makes for an easy, spill-free filling experience, and the QuickDry Hanger provides effortless storage and drying once we're done for the day.
Details
- Versatile hydration reservoir with bottle-like perks
- Open construction for quick drying and easy cleaning
- Speedclip attachment locks bag in place in Gregory Packs
- Integrated hanger makes for quick drying or hanging on trail
- Soft molded handle provides steady grip for filling
- Drylock magnetic bite valve makes hydration easy to access
- Anatomical construction allows reservoir to sit flat on the back
- Item #GREZ08Q
- Material
- metallocene polyethylene
- Volume
- 3L (183cu in)
- Hose
- inline, quick-disconnect
- Valve
- soft spout bite, magnetic clip
- Dimensions
- 3 x 17.2 x 7in
- Claimed Weight
- 7.1oz
- Manufacturer Warranty
- limited lifetime
- Activity
- backpacking, enduro, hiking, trail
Reviews
Q&A
What do you think about this product?
Overall Rating
5 based on 51 ratings
Review Summary
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.Customer Images
Here's what customers have to say
The hydration pack features a robust and durable construction with a wide mouth, flat back, and 3D design that make it easy to fill, clean, and dry. The detachable tube and magnetic clasp are convenient. Some users experienced issues with the connector or hose leaking over time, and the reservoir takes longer to dry out compared to other brands. Overall, the hydration pack offers thoughtful design and solid performance, especially for outdoor activities.
AI-generated from the text of customer reviews.
View
Selecting an option will reload the available reviews on the pageOctober 6, 2025
This has everything you could want in a hydration bladder! I don't think I will ever want a different bladder style.

Originally reviewed on ExpertVoice.com
September 23, 2025
Robust an Durable with solid features
Well made, durable on a number of trips over the past year from short hikes to week-long treks in the Hindu Kush. I love the handle and 3D shape, makes handling very easy. The feature that would make it virtually perfect would be to make the threads of the cap match that of a wide-mouth Nalgene water bottle. This would enable the bladder to be efficiently and easily filled with an MSR Guardian purifier directly screwed onto it. It would really take the experience to the next level, but it is certainly solid where it's at.

Originally reviewed on ExpertVoice.com
September 4, 2025
3D HYDRO 3L RESERVOIR
Ease of cleaning, the 3-D characteristics of the design and the hanger, that it remains open with airflow/cleaning drying process. Also the design of the quick connect two piece hose as being located approximately even with the water fill cap. This makes it easier to change out hoses. The on and off mechanism push your pole to disable water flow in mouthpiece. Well thought out to sign. It just works no gimmick.

Originally reviewed on ExpertVoice.com
August 2, 2025
It works well.
- Familiarity:
- I've used it several times
I have mixed feelings on this hydration bladder. It works like advertised. I like how it hooks into the Gregory packs and stays in place. I really like how it holds itself open for drying. The magnetic clip is nice addition too. The mouth piece works well and in general it does a fine job. What I didn’t like, is that its 3D design makes it hard to fill in a shallow sink like most hotels have. I could only get about 2 liters in the bladder out of those sinks. Also the mouth piece doesn’t fit through the opening on my Gregory hydration pack, so I have to separate the hose at the coupling and feed it through. The problem is that if you have the tube full of water, when you uncouple the tubing, it leaks/drips a little. The amount that it drips is tolerable. All in all, it does the job well!
July 30, 2025
Perfect for long hot hikes
Fits like a glove in my day pack and is easy to clean.
Originally reviewed on Gregory
July 28, 2025
Great product
I love the Gregory Reservoir placed inside and on top of everything horizontally and in the side pockets. Returning due to ordering the wrong size.
Originally reviewed on Gregory
July 16, 2025
Well worth it.
This thing is awesome. I bought some cheaper ones on a rainforest site but was just never happy with them. Cleaning and drying was difficult on those. The structured part of this makes cleaning and drying a breeze. Also, the connection makes it super simple to get the reservoir in your bag and than connect. Highly recommend, don't waste your money on anything else, you'll just end up getting this one in the end.
Originally reviewed on Gregory
July 7, 2025
Amazing 3L Bladder
After finally upgrading packs (to Nano 16 from a smaller Osprey pack) and upgrading water bladders to a 3L (from a 2.5 Osprey) I am so happy I tried Gregory. I love how you can easily snap off the bladder hose when filling up or drying out the bladder. I love how the bladder also has a hook attached, so you can easily hang it up to dry. It opens and closes very easily. This 3L bladder was perfect for our daily excursions in Costa Rica, and I will be taking this for day hikes in Crusted Butte in a couple weeks and can’t wait!
Originally reviewed on Gregory
July 3, 2025
Nice product
Great water bladder. I like the quick connect hose. In addition the magnet for quick connect is very nice
Originally reviewed on Gregory
June 7, 2025
BROKEN AGAIN!
This is my second Gregory 3D hydro 3L reservoir. I purchased this to replace the one that broke after only about six months of use. NOW THIS ONE HAS BROKEN AS WELL, after only about 4-5 uses. It appears that the connector is the issue. There is no pressure in the tube to be able to receive water, it just bubbles and goes nowhere.
Originally reviewed on Gregory
Do you have a question about this product?
July 15, 2025
Is the TPU used inside in the bladder Food-Grade TPU? If not I read that it could be dangerous to use…
Originally reviewed on Gregory
July 2, 2025
Is this compatible with the Miko 20 Pack?
Originally reviewed on Gregory
January 14, 2025
Would this fit in the Gregory Swift 16L H2O bag?
Originally reviewed on Gregory
November 4, 2024
What is the tubing? Nylon?
Originally reviewed on Gregory
September 4, 2024
What is the inner diameter of the tubing?
Originally reviewed on Gregory
August 23, 2024
Can you put hot water in this to use as a hot water bottle at night?
Originally reviewed on Gregory
May 26, 2024
Can you give the size of the O-ring that seals the hose connection to the reservoir for the 3L size? I lost the O-ring and cannot find the dimensions to purchase a replacement. Love this product and want to keep using it! Thanks
Originally reviewed on Gregory
March 31, 2024
How do I get the plastic taste out of the reservoir. I took it on a week hike in the Alos in Switzerland and could not drink the water it tasted horrible and I cleaned it appropriately before use. Thank you.
Originally reviewed on Gregory
October 16, 2023
How do you get the water flowing the first time. It won't come out. What am I missing?
Originally reviewed on Gregory
April 20, 2023
Is there any difference between these 3D reservoirs and the original 3D reservoirs?
Originally reviewed on Gregory
Related Categories
Related Searches
Gregory 3D Hydro 3L Reservoir reviewBest hydration reservoir for hiking and bikingDurable 3L hydration pack for outdoor adventuresEasy to clean hydration reservoir for backpackersLightweight and versatile 3L water bladderSelf-supporting reservoir for active lifestylesQuick-dry hydration solution for trail enthusiastsMagnetic bite valve for hassle-free hydrationSoft-molded handle for easy filling on the goCompact and functional 3L reservoir for all agesTrail-ready hydration reservoir with integrated hangerBacterial growth prevention features in hydration packsLearn more about 3D Hydro 3L Reservoir