Some tips I learned about pet food storage...

-Keep dry pet food in the ORIGINAL BAG if at all possible.
-The bag can then be put inside something plastic, but transferring food from the original bags to plastic bins has been proven to negatively affect palatability.
-In addition, food in plastic containers oxidizes faster and therefore degrades more quickly (e.g. loss of polyunsaturated fatty acids and fat-soluble vitamins).

(This information comes from a DVM boarded in veterinary internal medicine that knows more about the inner workings of the pet food industry than anyone I know.)