• Online:
  • URL for this product:
  • From the U.S. and CanadaCall 1-800-426-4840
  • Mon. through Sun., 4 a.m. through 11 p.m. PT.
  • InternationalCall 1-253-891-2500
  • Mon. through Sun., 4 a.m. through 11 p.m. PT. English language only.

GEIGERRIG Hydration Engine Reservoir - 101 fl. oz.

This item is currently sold out or unavailable online.

Or, may we suggest shopping for similar items:

Shop more Pack AccessoriesShop more GEIGERRIG

This page is provided for reference to historical product information.

  • Other reservoirs require that you suck on a tube to get a drink; the GEIGERRIG reservoir can be pressurized with the included pressure bulb to allow for convenient spraying
  • Spraying makes drinking, cooling off, cleaning gear and sharing water simple
  • Filling the GEIGERRIG is easy—simply slide the top off, open the reservoir and fill it from a faucet or a high-mountain stream
  • Top of the reservoir opens wide for easy filling and cleaning; GEIGERRIG reservoir can by cleaned on the top shelf of your dishwasher
  • Quick-release valves let you remove the drinking tube and pressure tube whenever you want to refill or clean reservoir
  • On/off switch on the bite valve prevents leaks
  • GEIGERRIG Hydration Engine reservoir is made out of tough thermoplastic urethane that withstands regular use


Item 831078


This item's hot - and it's only available online.

REI Membership

GEIGERRIG Hydration Engine Reservoir - 101 fl. oz. Specs
Best use
3 liter
101 fluid ounces
(Reservoir) thermoplastic urethane / (air bladder) thermoplastic urethane/nylon / (hose) TPU
16.75 x 7.25 inches
6.5 ounces
0.18 kilogram
Liquid capacity (L)
Liquid capacity (fl. oz.)
Bite valve shut-off switch
Wide-mouth opening
Quick disconnect tubing
BPA free
Weight - metric

GEIGERRIG Hydration Engine Reservoir - 101 fl. oz.

Loading Ratings & Reviews...

Rated 4.1/5 based on 10 reviews
Rated 1out of5
by fromI want to like it This is a simple design, easy to fill, easy to clean. But I couldn't get rid of the terrible taste of the plastic components. I added ice to the water, I tried baking powder, I tried the cleaning tablets dissolved in water, I tried lemons. I finally had to replace it with a competitor that didn't have the taste issue. I really wanted to like this product as it is a wonderfully simple design - they all should be so simple to fill with water and add ice, clean, and use. But the terrible taste rendered it unusable.
Date published: 2013-05-29
Rated 3out of5
by fromHydration Reservoir Great idea I think. This allows you to pressurize the reservoir. I do not think it was that difficult to drink from one of my old quality reservoirs. It does allow for multiple people to use and also to put the water in another container. Can also use it as a quick trail shower.
Date published: 2013-04-24
Rated 3out of5
by fromNot as great as I thought it would be What a great idea; a pressurized hydration bladder. I jumped at this one. However, having used it for the past two months, I have grown less impressed by it. First I will say that the workmanship is great; solidly made with no poor or cheap connections anywhere; down to the "snap-in" hose connections. The wide mouth of the bladder itself is terrific for filling and cleaning. The welds on the seams that separate the air chamber from the water chamber is flawless. The slide closure holds well under the heaviest pressure. The bite valve did not drip and closed securely in the "off" position. The unit itself fit comfortably in every pack I own. Everything about this bladder screamed quality. I really wanted to love this thing...but I didn't. Not because it's a piece of junk; far from it. My only complaint was with what it is supposed to do. The idea is that you can pressurize it so you don't have to suck water out of the tube; you simply squeeze down on the mouthpiece and the water squirts into your mouth or the mouth of a companion. The bladder pressurizes fine but it didn't hold pressure very long; it seemed like I was pumping it all the time just to take a drink. Thinking it had a hole or leak in the air system somewhere, I checked it over several times; no such luck. I wound up just sucking water from the tube, as usual. It could just be that I drink alot of water on my hikes so it never really had the chance to maintain enough pressure to "squirt" the water all the time. A little background on my hikes; I live in Vegas and spend much of my time in the desert, especially in the summer. I hike with 4 to 8 gallons of water depending on the distance. For a small hike (under 6 miles) I generally carry about 5 gallons and I will be just about empty by the time I get back to my truck. Mind you it is no inconvenience to suck the water out, but I bought this rig based on the company's claims. The unit is great in all other respects but I found its advertised function fell short. I still use it because it is so easy to clean but I just don't use the inflator pump. I have recommended this rig to friends with the caveat that they shouldn't expect too much from it.
Date published: 2013-06-04
Rated 4out of5
by fromEasy to use, easy to clean I use this hydration engine while hiking, and the pressurized bladder works as advertised. It's easy to spray water where you want it and is very easy to drink from. It starts out with a very strong plastic taste, but lemon juice in the bladder and hose seems to have taken care of that. I recommend getting the insulated drinking hose if you'll be out in the sun, because the water in the line gets very warm without it. I love that it's dishwasher safe, and easy to invert for cleaning.
Date published: 2013-06-26
Rated 5out of5
by fromUltimate Hydration! This is not only the best hydration pack I have ever used but my favorite piece of gear. Pressurizing the water makes perfect sense and it is a true asset when on the trail. I use this mainly for backpacking and just being able to bite the valve and get a cool water injection is such a great feeling; effortless. Also, being pressurized secured my whole pack. All of my gear is rock solid stable in my pack once I pump up my g'rig. I was skeptical because it all seems gimmicky but this product made my backcountry experience just that much more enjoyable.
Date published: 2013-05-20
Rated 5out of5
by fromNot just for everyday outdoor activities This hydration engine was included in the Rig 1600 that I got and was totally blown away by it. Let me start by saying this: Plastered all over the website are sweet pictures of people doing things like mountain biking, skiing, skydiving and all manner of outdoor activities. By no means are Geigerrig products limited to that sort of thing. I often times find myself in extreme, remote areas of the undeveloped world where water is either scarce or extremely foul. I recently took mine to the hardest hit areas of Haiti. These areas literally had no clean water. What you filtered is what you had for the day. During our 14+ hour days, this thing was amazing to have. I know some people prefer the smaller engine, but this 3L saved some of my buddies' hides on more than one occasion when they ran out of water. And, just like they advertise, it's so easy to fill up a water bottle with or to spray directly from the tube. Being able to do that without them putting their mouth on it was crucial when they became ill, thus stopping the spread of the bug. The zip top is so money when trying to fill it. And although this is a different Geigerrig product, the in-line virus filter took all the fear out of drinking the water and worked great. These things are tough as nails and easy to field clean (used a little diluted Listerine and flushed it through the engine and tube). Not a single problem with the engine other than the on/off switch on the tube not biggie there. Oh, and probably the greatest thing about Geigerrig is their top-notch customer service. No joke, if you give them a shot for nothing else, do it for the simple fact that they make the best gear out there and STAND BY IT. It's unbelievable. Give these guys a shot! All my other hydration systems now sit in my closet!!!
Date published: 2013-06-18
Rated 5out of5
by fromWorth it! I hike the Colorado Trail and CDT regulary and have found my new go to hydration system. It may be a little heavier than some but the durability I get with it makes up for the extras ounces. With the inline filter I can now just fill up the bladder and keep going intstead of sitting there and pumping a hand pump. I have also used this system to filter water for hiking buddies who needed clean water and were too tired to hand filter thier own. I had a question about how to attatch the filter to the bladder so I emailed them and the Owner responded to me personally, the service I got was the best I have ever had to deal with. So for all those who have any issues with any Giegerrig product I would say contact them and they will take care of it.
Date published: 2013-06-19
Rated 5out of5
by fromBest hydration pack I've ever used I bought the Geigerrig pack a couple years ago, and absolutely love it. It has a pressured bladder, so you don't have to suck out the water from your pack anymore. Doesn't sound that amazing perhaps, until you actually use it. I give my dog water on our hikes without having to bring a bowl, and there's no slobber on the mouth piece. My dog loves it and will come to me when he's thirsty. The pack is also super easy to clean, so I can put in mixers, or non-pulpy juice if I'm riding in the snow. I can come home turn the bag inside out and clean the bladder. I also got the filter system which is great when I pick up water from the river. I totally would suggest this to anyone looking for a new or upgraded pack.
Date published: 2013-06-27

Ask a question and have it answered by REI product experts and fellow outdoor enthusiasts. Need immediate assistance? Use Live Help.

Loading Questions & Answers...

How are we doing? Give us feedback on this page.

      FREE SHIPPING With $50 minimum purchase

      • Join REI today!
      • REI Membership
      • REI member benefits include an annual refund (typically 10% on eligible purchases).
      • Join REI today!
      • Sign up for REI Gearmail®
      • and get 15% off selected items!
      • Store Locator
      • Locate an REI store near you.
      • Find a Store
      © 2014 Recreational Equipment, Inc. All rights reserved. REI, the REI Tree and Mountain design, Novara, and
      REI Adventures are trademarks of Recreational Equipment, Inc.

      Find REI on: FacebookTwitterYouTubeFlickrMobile site