Hey, just to be 100% clear - because it says “backpack” in the description - this is NOT a backpack*. This is a pouch that holds a hydration bladder that CAN BE ATTACHED to a mil-spec vest. But it is not a standalone hydration pack.
*-I mean, it is a pack that can be held on your back, so … yeah. But in the sense of “a few straps that will hold this on your shoulders”, no. It’s not a backpack.