I have been storing grains for well over forty years using what was the most current method at that time. The first buckets of wheat I stored were in five-gallon square metal cans with a friction lid. We put bay leaves in there to help keep the insects out. Many years later when these cans were opened, the wheat was still in good shape, although some would not sprout. However none of the wheat went to waste, some was used for animal feed.
Later many people started to put dry ice in the bottom of the metal cans or food grade plastic buckets, this worked well. The dry ice evaporated and forced the oxygen out of the containers. Today the preferred method for storing grains is food grade plastic buckets, Mylar bags and oxygen absorbers.  Now everyone of these methods worked.  I have never lost any grains that I stored with anyone of these methods. In my opinion, the Mylar bag method probably works the best and keeps the highest level of nutrition.
The method that I would like to try for storing grains is the five-gallon metal buckets with 3000cc oxygen absorbers. I think that this would be the best of both worlds. The metal cans do not breathe so you could eliminate the Mylar bags. The square cans stack better and take up less room. Rodents can’t chew through them. The downside to the cans is that if not kept dry they can rust.
I have been searching for a good reasonably priced source of these buckets. As of now, I have not been able to find one. If you know of a good source please let me know. Price is important because it takes about 30 cans to store a thousand pounds of grain
But the best news in all of this is that everyone of these methods has worked. Today I would recommend that you use the plastic food grade bucket, Mylar bag and oxygen absorbers until something better comes along. Sealing Food in Five Gallon Buckets is an Important Skill for Preppers
Don’t forget to rotate your food and check on its condition periodically. You don’t want a nasty surprise when you go to use it in a real emergency.
Howard
I have been using Vittle Vaults to store grains – I first got them for keeping my dog’s food in there. Then I realized they are perfect for grains. I flush them with CO2 before and after filling them. It works well for me. Thanks
They would work but that is an expensive way to store grain. I think you should have 200 lbs per family member per year minimum. Than can be a lot of vittle vaults
Howard