I've used it on a lot of long rides (a couple of 200ks, yesterday's 100 miler, a 400k - yeah, my "timing's" not great ). It works great. When I was on coumadin, it was tough to get more than 4 hours out of it , but now under normal circumstances, I can get through a long ride (10 - 12 hours) no problem.

I would not take a chance on enptying it in a porta potty. It's possible to drop it in the process. That would not be good.

Be sure it is "in" enough so nothing is protruding or rubbing.