Buckets are a great grain storage container. My rule of thumb is 5 lbs per gallon. So, a 5 lb bucket would hold about a half bag of grain.
Also Consider: The Gamma Seal Lid – Gamma Seal Lids have an outer ring (that typically stays installed) along with a center section that spins on and off. It’s airtight and easy to open and close.
Update: Since this post was published the price, availability or promotion has changed. Check the product page for current description, price and availability. Also: Today’s Deals on Amazon