I had some bought for me as a joke, I just looked dignified as I accepted them and stuck them in the car glove box. Gave one away to my boss (she was delighted), used one to see what it was like, still got the last one somewhere.
The one I used did everything it promised. However, I had a kidney stent fitted for 6 months in 2003, this makes you need to go to the toilet every 10 minutes, camping was a nightmare.
I started taking an empty fabric conditioner bottle for night time use in the tent. Wide neck, plenty of capacity. It gets thrown away at the end of the trip (after emptying).
The stent is long gone, but now when I use the last of a bottle of conditioner, the bottle is kept to one side for the next bike rally or camping trip. Now I don't have to find my trousers and boots in the dark, then climb out into a freezing cold wind like the old days.