Answer:
If you lose me you may cause people around you to lose me too.
I come in different colors and shapes. Some parts of me are curvy, some are straight. I look like I can belong anywhere but there is only one right place for me. What am I?
My first half means container. Not a lot of people understand my language.
What can fill a room but takes up no space?
I go inside boots and outside shoes.
When is it bad luck to see a black cat?