Protective Cooler Bag for 2L or 3L Hydration Water Bladder Pack > Keeps Water Cool & Protects Bladders > Thermally Insulated, Water Resistant > Ideal As a Backpack Cooler - Bladder is NOT Included

I have both the 3L & the 2L. I've used these to keep water bladders cool on trail runs and steep hikes in the heat in both Solomon Skin 12 tight fitting vests and in a Deuter Futura 26 pack. Both sizes performed perfectly in both packs. They are extremely light and insulate very well, The only complaint is also a benefit - because they are rectangular, they will fit any shape bladder, but that also means it doesn't fit any bladder perfectly so you have extra insulation material to fold over or pack down in some way. Regardless, it is so light and insulates so well that it is worth it. I highly recommend it for these reasons.

This works great for hiking. It fits my 2 liter Gregory 3D Hydro Reservoir perfectly and keeps my water cool as advertised. Worth every penny.

I just received this product and haven't had a chance to really test it but based on experience it looks like what I needed. I have been using hydration bladders for years and for years I have used camelback bags. It gets really hot here and I do like cold water so in the past I have made my own sleeves from aluminized bubble wrap. To be sure - that really works and it just takes a little patience to get the right fit. I have one in my 3 liter camelback Mule right now. But I wanted to be able to use a bladder with an older Duluth rucksack and my homemade jobs were not making the cut. I looked at the camelback standalone bag and it looked interesting enough for me to go to a local retailer and check them out. Very nice bags - not a good fit for my pack but I would have liked one as a back-up bladder when I lived in the desert. I also checked out the Deuter sleeve - its really nice and I use Deuter and Osprey backpacks so I was really interested. It was too big - I really needed a slim two liter sleeve. Just got this little guy today. My two liter bladder is a snug but appropriate fit and it is an exact fit for my old Duluth rucksack. I am going to give it a try tomorrow. The center location for the tube exit looks like it will work well but it looks like it will be easy to route the tube out the side if need be. For the cost - this looks like a good value. Our heat index today is 102 with high humidity so tomorrow will be a good initial test for me. As a side note - it is too large to fit in my camelback rogue that I use when biking. The rogue does a good job of insulation so I didn't need it for that application but I tried it anyway.

I have a Deuter 3L but needed something smaller. This was much cheaper. I got the 2 L and used it to train for 3 marathons and I don't know how many half marathons.I run daily and carry a 1.5 or 2L Camelbak in a Nathan VaporHowe running vest. During Arkansas summers, I fill a bladder with ice and water and wear it while I but another bladder of ice water in my car. On a 20 mile run, I'd wear one until it melted and then switch to the fresh one to keep my back cool.In the cooler weather, I still like to have cold water, but I don't like having ice water against my back. This keeps the water from making me cold.Since this cost so much less than the Deuter, I don't mind folding it up in my running vest when I get hot.I lost it and am now ordering a new one, because I used it every day. Held up great. I doubt you're supposed to wash it, but it stunk and I did. (My fault for sweating so much)

These have kept our water cold even in summer hiking. Previously our water bags inside our backpacks would heat up to ambient temperature. With these, the water in the tube to our mouths warms up, but the water in the bag is still refreshingly cool, even after hours.

Nice keeps things cold or perfect temp. Great product. Does what it's supposed to do.

This bag needs a re-think on design and material. The "fly type" buttonhole to pull the drinking tube through is more of a pain than it is useful. The velcro on the closure flat is 10 times stronger than it needs to be. It ripped the insulation material off the bag on the first opening. I like the bag. It looks good. Just needs refinement.

We bought 2 of these for our 1.5 and 2 liter bags. We also tossed in a thin lunch ice pouch. This kept our water and snacks cool while we were in Zion where it was over 100 degrees.