They wouldn't be rodent proof but if you don't have that issue they're great.This is something I've been wanting to get to store my flocks feed in. I've heard good things about them. Vittle vaults
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I have three that I've had for years now.
A cheap alternative is they make a lid for 5 gallon buckets too. I got a few from Lowe's a couple years back for like $8 each.
Been experimenting with bucket feeders so I'll be getting more soon for those.