Best Rear Hydration System
937158
The best rear hydration system out there.  I have tried several different setups including zip ties.  I haven't lost bottles with this because it absorbs some of the shock.  My favorite part is being able to easily switch between a single and double cage set up.  It's quick and easy to set up and several positioning options.
3058576
I love this product. It looks great and fits perfectly when i run. Everything about this hydration pack is perfect. I use to for running, hiking, traveling, theme parks. For Running: not needing to carry a water bottle feels very good, and most importantly this hydration pack does not hurt my back when i run. Worth every penny, I will purchase another one shortly. Thank You.
1766359
Great item to have when your out in the camp site with the family and friends. I got the big 64 oz. size because I knew it will hold more water. Common sense when you are in hot weather, you need to drink more fluids to stay hydrated! The lid stays tight and the wide mouth makes it easy to clean the inside. Good stainless steel, mine had no dings or dents when I got it. I recommend this product to my friends and family!
2622649
I use this for road biking. Great product to keep hydrated with plus great storage for my phone, wallet, keys, tire levers, spare tubes, co2 cartridges and cleat covers. I love this product and highly recommend.
841474
I couldn't be more pleased with this product; it has been a great purchase.

The Geigerrig Hydration Engine has the most innovative design of any type of hydration pack. At first glance, I could tell that it was made to be durable and convenient. I have had challenges with other packs with both filling the bladder and also cleaning it after. In the past, the tubes of other packs have built up a dark residue because the water can't be completely cleared out. This pack opens completely at the top, which makes it easier to be filled completely, and after use, it can easily be turned inside-out to dry. Both the tubes, the one for the air hand-pump and the other for the hose, can be disconnected and dried. You can also put the bladder in the dishwasher!

The hydration system is great because it can be pressurized so you don't have to struggle for water. Just bite down and the water will spray into your mouth! It also comes in handy if you ever need to spray water to share with others, or to clean dirt off of your equipment. Yeah, no more tilting your head awkwardly below the pack to get water when it's low, or shaking it to share with an outside source.

Again, I am very happy with the product and very pleased with the service that Geigerrig provides. I'm confident that you'll be pleased with your purchase as well.
4790800
I am an ultra & marathon runner.  I've had one of these for many years and it's gotten a LOT of use.  I've replaced the bladder five times due to mold (about twice a year), but I put sports drink powder into solution when I run.  I wanted to try some different systems, so I bought three kinds of bottle-fanny pack products.  The CamelBack Flash Flo is by far superior to all the other systems I tried.

In order for the bottle systems to carry as much fluid as the FlashFlo, they need two bottles.  Even with the bottles at a slant, my elbows hit the bottles.  Even when walking, the two bottle belt system is very incomfortable to my arms.  The Ironman one bottle system didn't hit my arms, but the lid was unusable.  The third system had much smaller bottles.  The small bottles relieved the arm hitting problem, but they don't hold enough water.  Cambelback FlashFlo is superior.

This product holds a lot of fluid and sits comfortably on my hips.  I'm a female nearly 6 ft tall but have a very small waist.  Another great advantage over bottles is that you can just sip and keep running.  For me, the sipping hose allows a time advantage over the bottle system which takes longer to operate.  I admit refilling takes longer with the camelbak, but it's not a major hassle like some of the other reviewers made it out to be.

I have never noticed the fluid sloshing around like some other reviewers have reported.  Maybe it's because I have used it for so many years.  I only wish there was a warning system when the fluid level is almost out.  Nothing more disturbing then sucking in the last drop when I've got a few more miles left to the trailhead.

Highly recommend this product to competitive trail runners.
102843
I got the hydration bladder for a discount price for my field review of this product.  well where to start well first of all the shipper was fast got it in 3 days when stated 5 on tracking.  after inspection it is very well made and stitching is up to par with more expensive carriers that I own. this is true molle webbing the spacing is exact not off like some others I have seen. the bladder is included and easy to put into  the bag and you can choose which side you run the water hose.  one thing that is different than other bladders out there is the the fill cap is on the out side of the bag and can be filled without taking the bladder out of the carrier which I really like the other one I have you have to take everything out and off  of you carrier to fill it and try to put it back full of water and re run your hoes this system is much nicer and faster.  more expensive carriers out there .. yes is this carries worth it ...yes  if you need a good system get it the bladder holds 2L of liquid and can even hold ice packs to keep what ever you carry cold on those hot days.
3178311
I've had this hydration vest for a bit over a year now.  I got it originally so that I could take water and fuel with me on my longer runs without having to carry a bottle.  The webbing and design of the harness allows you to fit it to your back and it just sticks there.  The added bonus is that the cold water bladder feels really good on your back on hot Texas days.  There is no bouncing while running and even after 10+ hours on the trail, I have never had any problems with chafing.  I also use it for longer bike rides, although due to the different body position, I tend to leave the chest strap unfastened.  This is not an issue anyway since road cycling doesn't cause any real jostling.

The pockets in the front are handy with the zip-up enclosed pocket being a perfect size to put my iPhone in.  This pack strikes a good balance between giving adequate storage space and staying small.  If I need to get at items in the big back compartment, I can unsling the pack, get what I need, and then throw it back on, all without breaking my stride.

The only problem I have had is that the open/close elbow valve for the water spigot has gotten a bit tough to open.  This is an annoyance while running and a downright impossibility while riding.  I think I got some debris in it though, so I don't fault the design of the pack.  The elbow and valve is modular and easy to remove from the rest of the pack to troubleshoot or even replace if need be.

Over the last year, I have been seeing more and more trail runners switching to Nathan from competitors like Camelbak.  I think this is the way to go.
2228535
This bag is way better than my camelbak and I would recommend this to everyone looking for a day bag with a hydration system it is very comfortable and the padding is amazing this bag is a must have
2745878
This is great. For long, hot trail runs without water stops or support. I freeze it full of water then put it in the back of my hydration pack, next to the bladder. It keeps the fluid in my hydration pack cool while it thaws out and when my hydration pack is empty. I can drink the thawed water. Sometimes I have 2 in there if I am going really long on hot days 20+ miles.
2059725
I absolutely love my Simple Hydration bottle.  I got one last summer. The size is perfect for most runs because you can refill if you need more water but it's not so big that it's cumbersome.  You can slide it into the waistband of your shorts or running skirt in the back and will find that you don't even notice its there.  Put some ice in the bottle in the Summer for an extra special cooling sensation.
2976295
After being in the military...I will recommend a Camel Back for any outdoor enthusiast!  The M.U.L.E., with its 3 Liter (100 oz.) bladder and all the storage space saved the day for me this morning.  I was riding to work when I got a flat tire...luckily I packed a spare tube and all the tools I needed to fix it quickly and get back on my way.

A definite must!!!
909153
I bought the Viper 5 Hydration pack for my son for some of his more intense mountain bike rides. Needless to say, I was completely envious - my Camel doesn't even come close to the Osprey! Special features are the easy threading/ access to the tube feed , HUGE bladder and the comfort of the shoulder straps once the chest and waist straps are secure. Lastly, it is one tough looking pack, with plenty of extra storage without the bulk. I highly recommend this product!!!!!!
4601652
I received my backpack within a couple days and am loving it. Used it twice this week and it's lightweight and holds a lot of water. Description online is accurate. Highly recommend if you are looking for a lightweight hydration system (does not hold much else other than a key and small wallet) but perfect for my needs.
154923
Ulitmate Direction hydration reservoir along with their vestt is great fur long endurance running or hiking. Doesn't slosh much. Easy to clean. Will continue with this brand!
4732536
I love this product!  Like all the Camelbak products I have owned, it works great.  It's so much easier to be able to disconnect the drinking tube from the bag for filling, emptying, cleaning, etc.  I like that the Camelbak stuff is made to get a few years of wear before it needs to be upgraded or replaced.  I just bought this conversion kit and used it on an old reservoir and saved a few bucks instead of buying a whole new reservoir with the Quick Link system already built in.  No other water reservoir system works as well as Camelbak, and I will continue to buy their products.
1258679
Very easy to install. Fits on flip down rear seat. Takes about 2 mins to install. Seat does still flip down. Kids love being able to have a water bottle holder.