I've been using soft flasks for a while now to fuel my adventures and up until recently have just clipped them to my backpack shoulder straps. While convenient, they bounced around an awful lot and were kind of annoying. This little guy fixes the problem. It attaches to your shoulder strap with a vertical Velcro loop at the top of the bottle holder and a horizontal loop around the middle. Once attached it feels pretty solid. I have a couple Hydrapak SF500 soft flasks and this holder accepts them, although begrudgingly. You can tell it was designed for the soft flasks that are longer and narrow and that don't have a rigid bottom, like the Salomon and Camp varieties. As such, my larger flasks are a tight fit but it still works. It appears that it'll hold up alright but the front is stretch mesh and I'm sure it'll tear if abused too much. In summary, this is a handy and inexpensive way to keep water and fuel close by.
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