I bought several of these type water bottle holders online and tried them all out. The Elemental Horizon's was the best. It flopped around the lease and was the best size for the 1/2 liter bottle I carry. I use it on my Deuter pack

I tried two at first, one on each shoulder, but have settled on one. It holds a 20 oz Smart Water bottle nicely. The small pocket works well for an energy bar. I am satisfied with this product.

I recently used 2 of these on a 33degree C day hiking in the Flinders Ranges, South Australia. They were much easier to use than a bladder. I could get a good deep drink without getting out of breath. And it was just as convenient. I carried 1.2 lites or 1.2 kg of water displaced from my back pack to my front where I did not notice it at all. I set them high so that they would not rub my arms. To do this I needed 4 clips but only 2 clips were provided. Well thought out Mathew

I got tired sucking on a bladder and when I saw a hiker with one of these bottle holders on his shoulder strap I decided to give it a try. Work very well although they flop from side to side when you walk. That is why I only rated 4 stars. I used a safety pin on each side and the flop disappeared. The bottle holders are perfect for .5 liter bottles. I am going to buy 2 more for another pack. Ditch the bladder and get a couple of these.

These worked well on my six moons fusion 65. They are remarkably wiggle free when you walk, and you can turn your head without bumping into them. When putting the pack on, loosen the shoulder straps quite a bit, especially for the second arm, so the bottle faces the right way out and the strap does not twist.