Answer:
You have to travel far before you turn it over. What is it?
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
Drop me and the world will shatter. You can always find me where you empty your bladder.
My first half means container. Not a lot of people understand my language.
You use me between your head and your toes the more I work the thinner I grow.
The warmer I am the fresher I am.