Instead of fumigating flour and grains (too much fuss), purchase a vacuum packer (about $199.00-makes a great X-mas gift) and vacuum pack up flour and grains as you purchase them on sale. Toss them into one of those Rough Neck style 30+ gallon containers or a plastic garbage pail and before long you are preparing. The Rough Neck can also be used for hydroponics growing later on. When the containers are full, label and seal with duct tape.
We use it to pack food when we go camping. All food is prepared ahead of time and put in the bags. They can then be frozen if you want, or refrigerated if needed. We never have anything but our empty baggies to pack back out, no cans, no boxes, etc. The bags are reusable. I have also stored antique clothing and material in the bags, anything that you don't want getting soiled or wet. Old knives or metal items do not rust as there is no air in the bag.
A vacuum pack is similar to the seal-a-meal device. You have a roll consisting of pieces of two-sided plastic, 2 sizes, 8'' wide or 11'' wide. Roll out the amount you want, any length, cut off and seal one end on the heated clamp on the device. Place anything, (dry or liquid, towels, batteries, anything that will fit that you can imagine) into the bag, put the open end of the bag onto the device, clamp down and it sucks all the air out of the bag and seals it. It's so simple to use. I know you can get this from Cabellas at 1-800-237-4444 (you can get a catalog mailed to you at this number too) and I think Sears and Wards still carry it. It's called a "FoodSaver vacuum packing system".
Offered by Mary.
FoodSaver also has vacuum sealers and supplies. The last bags I bought at K-mart were FoodSaver bags and not Seal-a-Meal bags. I think they are better bags anyway.
Offered by Clipper.