When I was a kid and we had the old school metal garbage cans we didn’t have much trouble with animals breaking into them. It was a pain to carry/drag those big metal cans out to the curb. The new plastic cans with wheels are much more convenient to push down the driveway but they are also convenient for critters to hop into. The light plastic lids on a hinge are a snap to open. Even if you strap the lid down it will only take an hour or two to munch a hole big enough to crawl through.