Night Ops

I am talking about the packs of water that go on your back. If anyone owns these, do they interfere with the parkour safety roll? I would like to purchase one whenever I upgrade to a BDU, but I did not know if all of the water would be squeezed out when rolling from a high point. I am assuming that the water is either pushed out or that the pack ruptures.

Never rolled while wearing mine, but they're sturdily built (at least the ones I own) and unless you land on something sharp, they should stay intact.