Keeping covers of metal cans on when throwing them

For those who have recycling services in their cities/countries, before throwing away a metal can after use, keep the can cap on.
Metal cans for food and pet food have caps on them and require a can opener to cut and remove them.

With he can opener you can cut open the cover and completely detach it from the can or keep it together at the edge as pictured below:

This way when you throw away the cans for recycling the covers can also be thrown. If thrown separately they are useless by themselves and will be thrown into the garbage. This will only add to waste so it is best to keep the can covers attached to the cans to be recycled along with the cans.