I want to recommend the Vittles Vaults. I usually buy and store two 50lb bags at a time in 2 large (50lb size) vittles vaults.
I tried metal trash cans but our humidity here is high and the ants here are holy terrors. I store my feed under a two sided carport by the chicken yard.
I have 2 large (50lb) for feed, one medium (30lb) for overflow, and 2 smaller ones (15lb) for mealworms, calcium, etc.
They are a little expensive but they keep the feed fresher and I haven't had any pest problems so I feel like they were one of my better investments.
I'm scared to death of rats so they've probably saved me from a heart attack as well.
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