Freezing chopped onions

I read that you could buy chopped onions but I couldn't find them in my grocery store.

I chopped my own and put it in a freezer bag. Whenever, I want to add onions to my soups, potatoes and dishes, I simply open this bag and add.

This saves money since you don't need to buy a new onion every time you go to the grocery store. The better part is you have less hassle since you only need to chop that onion once!