You don't need expensive vacuum engines and nitrogen compresors or even hand vacuum pumps. All you need are some air tight plastic pails or other containers and our 750cc oxygen absorbers. Toss a couple of these little wonders into a 5 gallon pail full of wheat or corn, pop on the lid securely, and in a day or two, you will have visual confirmation that the oxygen inside is gone, leaving only nitrogen and a concave, indented top verifying a slight vacuum inside the container. In the absence of oxygen, no weevils or other insects can live. Further, there is no oxygen to cause oils in seeds to go rancid.
Oxygen absorbers seem like the perfect means of preserving dry food long term.
One word of caution. After a year or so, the absence of oxygen can cause the seeds to be sterile. Get your oxygen absorbers early. As this is written we have a limited supply on hand, with more scheduled monthly. We are beginning to experience 3-4 week back orders on this product, but our manufacturer tells us they are gearing up for more production.