The 19 dropped to the floor the other day, severing the bottom off yet another Protank, so I am down to two that work and one that needs a replacement bottom. Grateful I still have the two though, don't get me wrong.
What is it with the Protank bottoms? I've read several posts where the bottoms have snapped off. The Bobo had one on and fell on the floor - the Protank didn't snap off, but is noticeably bent. It still works, but looks weird.