they do....just gotta be careful with them, especially if you have others in your tent and such......don't wanna corrupt the ladies just yet....
the last one I have I put it outside so it wouldn't, when the time was right zip lock back around the area, and shake...seal the bag....pick a girl...find a branch....put that section of the branch inside the bag and shake again........and always make sure you wash your hands and arms and such....mark the affected area with something, I use cotton string...