"Nothing" is ultralight and definitely multi-use.
Think of all the items that can be replaced with it?
Toothpaste - Comes up a lot, a useless item. Brush with nothing and your mouth will feel cleaner and fresher. None of that crappy aftertaste that other tooth products have. Although the TV teaches you otherwise, toothpaste is useless.
I have replaced many items with "nothing". The most multi-use item I know of.