Excerpt: I bought this holder to go on my Tamrac Photo Backpack. Wish I would have bought it sooner, it is really handy, just snap it on the backpack and go. It is part of the Tamrac Modular Accessory System, so it fits right on the pack.
Excerpt: I found this just too bulky when I put it on my belt. I can carry much more water in a regular water bottle that I attach to my belt with a carabiner. It was also just a regular water bottle. I have one that is insulated and will keep water cold for a long period of time that costs way less.