Freinds of mine use CO2 to store food what they do is place about a half a cup of dry ice in the bottom of a food grade 5 gallon bucket cover it with paper towels and put the dry food they want to store on top of the paper towels. Then they put the lid on loosly and allow the dry ice to start melting and displacing the oxygen in the bucket. They then put a lit match in the bucket and if it goes out they put the lid on tight.
My freinds only use the Rubbermaid totes to store dry items that are already in sealed bags, like pasta and stuff like that. All beans, grains, sugar, flour, and similar grains and grain products they seal in buckets.