There are many articles with suggestions on useful things to do with empty tin cans.
Just do a search for "what do do with a tin can".
Here is one link:
18 Off-Grid Uses For Tin Cans
https://urbansurvivalsite.com/18-off-grid-uses-for-tin-cans/
When camping on a shoestring this is what we used to do with a large can like a #10 or #12 (approx. 1 gallon size).
Back in the day it was often called a Hobo Stove.
You can cook directly on the top or with a small pan or pot.
A second tin can makes a handy small pot to heat liquids.
Common Food Can Size Chart
How to make a footstool with coffee cans
As children, we would argue when all of us wished to sit on them.
I love that concept, such a simple one and something all of us have around. And presto, we have cooking implements! A stove and a container for holding the food. How great is that :-)
I didnt know that a number 10 can was the same size as a 3 pound coffee can.