CamelBak FlashFlo LR Hydration Waistpack - 50 fl. oz.

Priced: $57.00 Rated:   - 4 stars out of 5 by 24 reviews.
CamelBak FlashFlo LR Hydration Waistpack - 50 fl. oz.
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CamelBak FlashFlo LR Hydration Waistpack - 50 fl. oz. -

The CamelBak FlashFlo hydration waistpack is perfect for runners, walkers and cyclists. It features an updated reservoir and carries as much water as a double-bottle waistpack.



  • Air-light wide-mouth port cuts weight and makes it easy to fill and clean the reservoir; quick-snap cap tightens in just a quarter turn


  • Mesh hipbelt and Velvetex™ back panel allow cooling air circulation


  • CamelBak FlashFlo hydration waistpack features reflective highlights on the front and back that increase your visibility in low light


  • External zip pocket secures keys and other small essentials


  • 50 fl. oz. Antidote™ reservoir features a welded center baffle and low-profile shape for stability
  • Lightweight and rugged waistpack offers easy access, making it a cinch to refill the included 45 fl. oz. reservoir
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Review RatingNumber of Reviews
Bite valve shut-off switch:Yes
Dimensions:14 x 6 x 4 inches
Fits waist/hips:Up to 46 inches
Gear capacity (L):3.28 liters
Gear capacity (cu. in.):200 cubic inches
Liquid capacity (L):1.5 liters
Liquid capacity (fl. oz.):50 fluid ounces
Material:Polyurethane-coated ripstop nylon/nylon taffeta
Number of exterior pockets:1 + main compartment
Pack access:Top
Quick disconnect tubing:No
Weight:8.5 ounces
Weight - metric:0.24 kilograms
Wide-mouth opening:Yes
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CamelBak FlashFlo LR Hydration Waistpack - 50 fl. oz. Reviews:

Positive Reviews:

Not for the really big people

I've owned this for several months now. I went into the store with the intention of buying a belt that would carry a water bottle or two, but when I saw this I decided to try it. I've very glad I did. It's easy to fill once the bladder is out of the bag and not difficult to put back. I'm able to ride for up to about an hour and a half in Phoenix-area summer weather before running out (or hike, walk or run). As one of the other commenters said, it's better to route the tube on the right side if you're at all long in the waist.

I've not had a problem with it bouncing. I just make sure that it's in the lumbar region instead of on my fanny and cinch it properly. It is a little sweaty there, but any belt is going to do that and it's much better than a full backpack. I'm a pounding runner too, so it would bounce if it were going to.

Cons: The tube could be a little longer. I don't have the tube clipped in to the guide at all and it's barely long enough. I have to bend my head more than I'd like to get the bite valve in my mouth. The belt was also a bit short for my waist when I started, although that's much improved since I've lost 30 pounds after buying it. make sure to try it on if you're over about a 48" waist and remember that in the store you don't have a full water bag, which will make a difference when you go to put it on.

Pros: Holds enough, lots of extra pocket room, stays put, cinches nicely. On the bike it has a very low profile on my back so not much wind drag or noise. The belt is substantial and sturdy too, with a buckle that is centered rather than to one side and the straps on both sides of the buckle can be adjusted, as well as the compression straps.
DBrashier at REI on 08/08/2011

Good Pack for Running Hydration

I used the pack for longer runs where carrying hydration is necessary. I have tried bottle belts and found them to bob too much and invariably the belt twists around. Carrying a bottle in hand also seems rather clumsy to me; I could not imagine doing that for 10, 15, 20+ miles, especially with the volume of fluid needed for those longer runs, one bottle in hand might not be enough (or would be too gigantic). I also tried hydration backpacks, but found it uncomfortable to have 50-100oz. fluid on my back and shoulders.

This pack gives me exactly the kind of hydration carrying style I like, and is quite stable, without a lot of up and down bobbing. One does need to tighten the waist belt periodically, but this is easy enough to do: just pull the two belt straps apart. There are also smaller straps in the back to cinch down when the fluid compartment is emptied more and more.

The complaint I read here about the tubing being too short: I did not find this to be short at all. I am 5'10-11". Plus, there is one more thing to try: the pack came from the store with the tubing coming out of the bag on the left side; the tubing actually comes out of the reservoir bladder on its right side, and there is an identical pack opening on the right for tubing to come out, so I just rerouted the tubing to come out of the pack on the right and that gave me even more slack.

Opening the pockets during running is not that easy; but I found it possible to just turn the bag temporarily to the front to open for gels, etc. and then turn the pack to the back again.

All in all, a nice hydration pack that avoids the "back to school" look and feel of a backpack, and keeps your hand free.
Jim Runner at REI on 10/10/2012

Best water belt I've used so far

I bought this for long-distance training runs and have only used it on a single 21-mile run so far, but I'm a convert. This belt holds more water, bounces less, and is far more comfortable than the water-bottle belt I've been using for two years. Be realistic, any belt that carries the weight of water is going to cause some level of discomfort and chafing when you're running for hours on end, but this one's shape, balance, and padding seem very well thought out. The large opening of the bladder allows you to add ice, which kept my water cool through a 3-hour run in 82-degree weather. The outside straps allow you to compress the pack, pulling it in tighter as you consume water, keeping the bouncing/sloshing to a minimum (bleeding out any air after filling helps, too). Drinking from the tube is easier than wrangling bottles in and out of a belt while running. The two zippered pockets have plenty of room for phone, ipod, gel packs, etc, and I was able to open and close them relatively easily while running, even with all the straps cinched down.

There may be better, more comfortable long-run hydration solutions--I've never tried running with one of the backpack-style systems, for example, but it just seems like the shoulder straps would chafe like crazy after a few hours of running. Until I find something better, I'll be using the FlashFlo for all my long runs. Love it.
mahony at REI on 08/08/2011

Great pak with a few upgrades.

I really like Camelbak products, I was a little skeptical when I read the reviews for this product. I went to the store in ABQ and loaded this pack and essentially ran around the store and found what I did and didn't like about it. Yes it will roll on you with alot of gear and water in the pack. BUT, it took me 5 minutes to fix that problem. I had one of those flexable cutting boards that were very thin. I cut it to fit in the pack (I initially used cardboard to ensure that I got the right size). I know what your thinking is that why should I have to go through all of this, well it's all about how you want to wear it. I didn't mind going through this to ensure that I would use this for a long time running. But that is up to you, there was no actual product tampering, just some minor addon's.

I also added a longer hose, I'm 6'2" and 250lbs so I needed a little more length on the hose so that I didn't fall over while running and trying to get a drink.

Don't let the flopping over get you to not purchase this product. YOu can fix this extremely cheap if you really wanted.
Pavewally at REI on 04/04/2013

awesome for long runs!

After running a marathon last month and suffering from dehydration, I realized I needed something more than my old standby water bottle on long training runs, especially with the summer heat coming on. This waist pack got mixed reviews, but I ran with it for an 8 mile run this weekend in 70 degree weather and loved it! I did sweat quite a bit under the pack, but I'm not sure how that could possibly be avoided. The pack didn't move around or flop at all, which is a real plus since I have sensitive skin and tend to chafe. As the reservoir emptied I was able to easily adjust the straps as I ran. This pack is going to be a staple for my weekend runs and I couldn't be happier with it! Plus buying it was a great excuse to try out our new Olympia REI, which was a pleasure and full of helpful people. Thanks, REI!
sarechka at REI on 05/05/2011

Great Buy

I was originally looking for a Nathan's or FuelBelt bottle carrier, but my wife bought this as a Christmas present for me, and I have not looked back. I used my first run with it to adjust, and then it has been a perfect companion for my middle to long distance runs. I just finished a 14 miler with the Camel Back yesterday and it didn't bounce or chafe at all. As well the pack gives you ample room to store keys, a cell or gels.
When I first ran with it the drink tube came out the left side and was shorter (because of where the tube goes into the bladder). Routing it out of the right side, gave me all the length I needed. Also it does have some minimal reflective tape, but since I run a fair amount in the dark I could easily add a blinky light.
jrcamp at REI on 01/01/2011

Great for long runs

All in all I am very happy with this pack. It holds way more than any of the bottle packs in terms of food and other support products that you need for long outing. If you move on to using the reservoir pocket for holding additional stuff you can fit enough for a good long day out. The cinch straps that help stabilize the water from bouncing are awesome.

Things to note however is that it takes some getting used to on cinching it down when it is full, and it feels bulgy until you have drank the first 5 - 10 ounces. I have only used it twice as of right now, so I might has some more to learn about it, but if you fill the reservoir on the go, be careful to let out the slack that keep the reservoir from bouncing.
MHDavidD at REI on 06/06/2011

just as expected from Camelbak

This was given as a Christmas present. I use it for trail running and short hikes. I thought I would hate wearing this on a run but it fits well and stays snug. I'm smaller (35" hip 28" waist) and this just barely tightens enough for me. I love being able to run on the trail with a larger bag (I was using a spibelt) so I can easily carry a phone, whistle, water & a few emergency supplies - I feel much safer on the trail. The hose is a little awkward at first but I just stick it through the hip belt to keep it out of the way. It was also a little difficult to get the bladder in the bag once filled but when the bag breaks in a little it's not as hard.
Honolulu Pam at REI on 01/01/2012

Best running tool I have ever bought!

I bought this pak when I was training for my first marathon. I had never worn anything like this before and had slight reservations. THOSE RESERVATIONS ARE GONE! I absolutely love my 'fanny pack' and the instant access I have to my water at anytime. The straps to tighten the pack down as the water level goes down are easily adjusted and the second pocket has always provided more than enough space for the extras I may want to take with me on my longer runs. I have only run out of water one time on an extremely warm day. I was at mile twelve of thirteen when I sucked the last of my water out. It really is an unbeatable accessory, especially if you are a distance runner.
Dalem6 at REI on 07/07/2011

better than expected

I use this on any run over 1 and 1/2 hrs. I would have given 5 stars if the belt buckles didn't loosen as I ran. When full I experience a little bounce, but after I drain 15 oz or so and cinch down the straps it's barely noticeable. Fixed the buckle situation with a diaper safety pin. No slippage now! This is a well thought out and executed waist pack(just fix the buckles). As to those who have a short tube problem, I don't get it. Out the left side and under the arm, plenty. I actually prefer to stow the tube in the belt clip as I run. I am 6'2" and 200 lbs as a size reference.
woodchipandy at REI on 08/08/2013

Negative Reviews:

Great Concept - Need Re-engineering

I've hiked at least 2 or 3 days a week on mountain trails for at least a couple of decades and often use waist or lumbar packs for shorter excursions. Other brands of of lumbar packs used with satisfaction include Kelty, Mountainsmith, Ultimate Designs and Black Diamond. Prior to purchasing the Camelbak FlashFlo waist pack, I'd had very positive experiences with the excellent Camelback backpacks, which proved to be well engineered and well made.

On short hikes with the Camelbak Flashflo waistpack, a couple of problems stood out. I am 6'2" tall and as noted by another tall reviewer, the hydration tube is not long enough and a tall user must stop and bend awkwardly to reach the tube, defeating the purpose of the convenience of a hydration pack. I solved this problem by cannibalizing another Camelbak reservoir from a backpack, taking the longer tube, and attaching it to the Flashflo reservoir. But this problem would have been easy for Camelbak to solve by simply providing a longer tube. Those who found it too long could easily have shortened it, but a taller user cannot lengthen the standard tube.

The other problem I was not able to remedy. When the reservoir is full of water and a few other small necessities are in the pack, the body of the pack tends to roll or sag backward from the top even when the waistbelt is cinched tight. Sometimes it almost seems to roll backwards until it is bottom up. The FlashFlo is poorly engineered in this respect. I've owned lumbar packs from various other manufacturers over the years and those that are well engineered invariably include some sort of engineering to prevent the waistpack from rolling backwards at the top, either by including additional adjustable straps, top and bottom, on either side, or by using internal stays, or other design features.

This is all unfortunate, because the concept is an excellent one, and the workmanship as with all Camelbak products seems good. There is a need for a good hydration reservoir waistpack. It may be that part of the problem is that whoever engineered this waistpack at Camelbak was trying to make it look "sleek", racy and uncluttered. If that was the case, unfortunately it was at the expense of comfort and utility to the point of being nearly useless to me.
Paleo Man at REI on 09/09/2011

Doesn't stay put.

I purchased this product for long runs during marathon training.

I also experienced the flopping issue described by others, but for what it's worth I suspect that it could have been due to operator error on my part with the compression straps - they cinch across the middle of the reservoir and it's possible that I was trapping water on the top while draining the bottom as I drank, thus making the pack top heavy. I only used it for one 18 mile run so if not for the deal breaker (described below) I would have experimented with this more.

The deal breaker was how when the reservoir is full the pack tends to bounce itself loose as you run, requiring constant (As in every 30 seconds) re-adjustment of the waistbelt. The problem goes away after the the resrvoir is down to about 50%. I started with a full reservoir & refilled at the 10 mile mark and experienced this both times. As best I can tell the webbing and buckles just aren't beefy enough for that much motion.

It would probably work OK for walking, light hiking and cycling, but for running the pack wouldn't stay put and completely drove me nuts.

I really like the concept of this product and wanted it to work. The hydration system functioned perfectly, I have no complaint about the quality there.

I exchanged it for a Camelbak Mule (Backpack style). We'll see how that one works out!
pointfivedude at REI on 08/08/2012

Not for Running

I used this pack on a 6 mile run today. I was not able to cinch the pack snugly to my waist, resulting in bouncing on my lower back that caused me to remove it after two miles and carry it for the remainder of my run.
I will be returning this pack.
While I was able to cinch it comfortably and tightly in the store, once the reservoir was filled, it became top heavy so that the top sagged away from my body no matter how tight I cinched the belt (I cinched it tightly enough to constrict my breathing and it still didn't stay in place). Also, the straps were not easily adjusted while the pack was on, and especially not while I was running.
I liked the idea of this pack, but the reality of it ruined my run.
Ambrose at REI on 01/01/2011

Disappointing modifications

I have a first generation of the FlashFlo that I love. I purchased a second and discovered that the bladder in the second generation has the "wings" where it supposedly fits across a broader area of the back, which I assume was to provide more stability and cushioning. The effect unfortunately is that it turns the bladder into a cushion that creates the unstable roll at many reviewers mention. The older bladder (without wings) is cinched firmly in place by the compression straps. This is impossible to do with the new design if the bladder is full. It is a great concept,but I want the old bladder back. Unless I can get a replacement old style bladder back! it is best used staying on the shelf.
drcharlie at REI on 10/10/2013

needs more straps

I bought this pack after returning an Osprey one, and after trying out this one on 3 separate day hikes, I returned it, too. I wish I had read the other reviews before purchasing this pack because I had the same problem with the pack flopping over when full of water and not sitting flush against my back; perhaps more straps would stabilize it?
Lynn2 at REI on 09/09/2011