Useful stuff to be kept in your truck

Imagine you are driving out of nowhere and there is no home or gas station to be seen within miles.
You have an urge and there is no bathroom, then you open your truck and take out this:



Plus, if you don't mind the smelling thereafter, you can use it as a stool.
I am just afraid it won't bear my weight and I am not eager to know what would happen if that stuff crashes under my butt.