I love these water bottle holders! I use them every time I go on a walk or in the car. I carry 1 or 2 of them with me everywhere. My husband uses them, too. Two years ago, I ordered 6 of them and just bought 2 more. I have several different colors of the 1L size, which hold 500 and 600 ML as well as 1L. These holders do a great job of keeping our water cold for hours, sometimes all day. I fill bottles 2/3 full of water, then freeze them, then top with water, so that they are put in the holders when mostly ice, then they gradually melt by the end of the day. We live in the very HOT climate of Abu Dhabi, United Arab Emirates and these are a necessity for me. They are great for traveling, too. I always put several in my suitcase for when I fly back home to Texas. Thanks!

Fit a 700 ml bottle of frozen water perfectly. Was snug enough not to slide around but loose enough to easily retrieve and replace while out walking or jogging. The sport cap was outside of the drawstring so more than three quarters of the bottle was contained within the bag. After 2 hours in 85-90 degree temperatures the bottle was still half frozen. I haven't tried a full liter yet but I don't doubt that will work similarly.
The front pocket is really small. Credit cards and single keys would be a good fit. I managed to get in my car key ring which has a small car fob, long car key, and 3 door keys; but, it was a dickens of a time getting them out again. With the nice zippered pocket, I had hoped to be able to carry just this while out on my jogs and not worry about losing my keys, but its too hard to get in and out unless I only carry the key that is needed that day.
I had been looking for a bottle holder that could strap onto a belt and thought between the included carabiner and strap I could rig something. I was pleasantly surprised that I could adjust the shoulder strap to fit around my waist so I could carry it on my hip with more stability that just the carabiner in the rear. For a normal stroll the carabiner itself seemed adequate. Since the strap is removable, you can also change it out with a size that fits your needs.

I love having the ability to keep my CamelBak ,1 Liter bottle cold during my workout, and the shoulder strap and small zipped pouch are extra, appreciated, benefits. However, the construction is not all that fabulous. I've ordered several of these over the years, and keep ordering because I can't find anything else on the market that fits this bottle as well as the convenient strap and pocket. I'm a gentle user, and they still fall apart, but it is after months of use.
The pluses are the long strap and zipped pocket along with the insulating ability
The minuses are the construction which is rather poor, the bag will begin to sweat after a while, so don't place it on bare wood, and the top is not insulated.
Still...I like it well enough to keep a supply at my house because I appreciate the benefits more than the minuses.

After searching for a water bottle holder, I finally found this one. I was surprised that I was not able to find one in any sporting good stores or outfitters that carry hiking and camping equipment. I purchased 4 of these and we use them ALL the time. It makes it so easy to carry a water bottle and it holds a variety of sizes. We have 16 and 22 oz refillable water bottles and it holds both of them. There is a small zipper pocket that holds a small size hand gel. I also like that if I carry a back back or bag with water bottle holders on the side, I can take the straps off and slip this into the mesh pocket. It keeps drinks cold and also keeps the condensation from dripping through the mesh pockets. I have also given these as gifts (and I lost one), so I recently ordered 4 more. Two of the 1L & Two of the 2L. I have not used the 2L yet, but I did put a 2L bottle of soda in it and it fit perfect. I also put 2 of the smaller bottles in it together and it held 2. Unless you carry 2 liter bottles with you, I wouldn't bother with the large size. They are also easy to keep clean. The only thing I didn't like was that it didn't ship from amazon, so I had to pay shipping fees which I thought were high considering these don't weigh much.

I ordered a case of six 1/2 glass gallon growlers for $30 bucks. And I might be using all 6 at any given moment and wishing I had more since I do a little home brew on the side.

I am walking into the local micro-brewery with three of those bad boys slung over my shoulder carried by 3 of these Bluewave Insulated Sport Sac Water Bottle Holder[s], Black, 2L; and not having to worry about the growlers clanging together as I hoist them over the bar to be quaffed full of my favorite local micro-brew. A two weeks supply of premium brew that will keep ice cold and stay fresh in the frig sealed tight in those glass growlers with poly-seal caps. Saves me a trip across town 2 times a week. Yummy.

These sport sacs are robust, padded and gathered at the top and fit those glass growlers perfectly. If you are concerned about cold storage as you are transporting the booty back to home base on those hot summer nights, I recommend the Coleman 16 Quart Excursion® Cooler filled with ice and safely buckled into the back seat.