Altoids candy comes in a variety of small, sturdy metal tins. The most obvious use for an empty altoids tin is for storage and collection.
It can be used to make a great survival or first aid kit, as well as to store food, tackle, fire starting components, what have you.
Use an altoids tin to make Char Cloth. Just put strips of cotton fabric in the tin, close the lid tightly, make a hole in the tin, and place it in a fire to cook.