Buy Cheap Nathan Synergy 3-Liter Adventure Pack 
Buy Low Price From Here Now Synergy has the ability to carry water and electrolyte drinks in one bladder. Hydration and gear carrying capacity designed for runs, rides, and hikes. Potency Dial allows you to choose pure water, electrolyte drink or a preferred combination.
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- 2-Way Propulsion Harness
- 100 oz. (almost 3 liters) with on/off settings.
- Electrolyte chamber has roll-top closure that allows full access for easy cleaning and mixing drinks
- Zippered main compartment with 750 cubic inch gear capacity
- Honeycomb mesh shoulder straps add comfort, prevent chafing, and dissipate heat
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"Great Adventure System Pack - Ultra Runner's Delight" 2010-09-21
By tonzo
I spent about a month testing out this pack and the most obvious thing I noticed was the no bounce fit. The true test came this last weekend when I took the Synergy out on the BD50K in the Issaquah Alps. The first leg was 16.5mi and the dual reservoir provided me the hydration I needed when I wanted it with water and energy drink in combination of my choosing. The pack had enough room in the stow pocket on the outside for my gloves and jacket. I carried a few "just in case" essentials in the main compartment, like cell phone, extra socks, and a foot repair kit and still had tons of room left over. The front mesh pockets provided plenty of space for gels and a zippered stow for other essentials.
I went with the Synergy to have the opportunity to carry extra gear and fuel for longer training runs and the potential overnight excursion. Although I wouldn't be packing a sleeping bag in it, Synergy would definitely carry enough to meet my needs and wears light and tight enough for a organized Ultra.
"Good Idea, But Not Well Executed" 2010-07-30
By R. W. Taylor (Woodland Park CO USA)
I do a lot of hiking in Colorado. I chiefly use this Synergy Bladder for climbing 14ers.
1. Not sure I trust it. The tubes on the bottom of each of the two bladders are push on only. I am constantly worried that one or the other is going to come off.
2. The bite valve has a screw on bushing to keep the drinking tube on the bite valve. It broke on first use. I called Nathan. They are sending me a new bladder because they do not stock this 25 cent part.
3. It's tricky to fill. If you over fill the water part, you can't fit anything in the hydration drink part ... and vice versa.
4. It's very hard to clean and dry. You simply cannot remove all the liquid from either chamber to ensure the units are dry. I have tried everything. I basically leave it full of bleach water until I need it the next time.
5. The Hydration drink portion has a fold twice and Velcro closure system. It seems to seal well, but it is VERY hard to grip the tabs to open it.
6. The little cross flow valve thingy is very hard to turn. You really need to set it up before you put your pack on.
7. The little cross flow valve thingy does not feed well through the holes my pack provides for bladder tubes. It's too large.
8. Finally you really have to work to suck liquid out of this thing. Bite and suck. I find myself not getting enough liquid unless I nearly continuously work it. My first time EVER dehydrated on a hike was with this Synergy system.
9. It needs some sort of hook so you can hang it while filling and while trying to empty it and dry it out.
10. Good idea, but it might be simpler to carry two separate 1.5 liter bladders.
"Terrible and Ridiculous" 2010-07-15
By Daniel J. Knight (Albuquerque, NM)
Whose stupid idea was this?:
1) Starts to tastes strongly of plastic within two days.
2) The fluid dial is very hard to turn, so if you have problems with your finger joints or your fingers are in pain somehow you're not going to have an easy time with this unless the pain is somewhere other than the parts of your fingers where you'll be putting pressure on.
The way the thing works is also nonsensical seeming: you put water in the all water section and strangely it fills in the energy drink tube, HUH? Why aren't they separate?
3) The water section has a water cap, but the energy drink section has a stupid hard to pull apart VELCRO ROLL OPENING, and why in the world is it rolled up? I'm guessing to keep the debri the velcro will accumulate over time from easily falling into the drink section, but why the Hell is it velcro in the first place? Not as if energy packets are massive and can't be poured into a cap and not like you need to dump a canister in and can't use a spoon. Whoever gave this thing positive reviews must have done so within a few hours after having gotten this thing and pain-lovers. I should have gotten a camelback.
The positive thing, and I don't know if any other hydropacks have this, is that the bite valve section can be turned, so that it's not putting so that you can position it in a neutral position in your mouth, rather than having a tugging feeling on your teeth from an awkward angle.
"Nathan Synergy Pack" 2010-06-12
By K. Kasin (Redlands, CA)
I am a long distance runner and have been looking for a pack that can carry both water and sports drink as well as snacks and a light jacket. This pack was suggested by a friend and has been just perfect. The dual bladder and mixing valve allows me to carry two liters of water and on liter of highly concentrated sports drink. If I need a quick blast, I can go for a straight shot of sport drink or I can use the mix valve to thin it out.
This pack fits very well and stays stable on my back even on some of the most technical trails. I would highly reccomend this product!
"Awesome hydration bladder" 2010-05-16
By R. Laenen (Australia)
I love my dual chamber hydration bladder. Took it out for a trail ultra today and loved it. So nice to switch between sports drink and water with such ease. Also nice and easy to clean.
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