That should work then. It's pretty hard for a rat, even a determined one, to do a "pull-up" & have the strength to push up on a cage-top- their front legs aren't that strong.
But it's best to have some kind of lock for peace of mind, or if the container lends itself (design-wise) to securing with large binder clips or some other way.
Sometimes even I struggle to open the one I have, they’re meant for industrial storage so they’re very well made
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"I'd rather be hated for who I am, than loved for who I am not" -Kurt Cobain