ditto here
simple food grade buckets or mason jars
no mylar
no vacuum
if I toss anything in, it will be a couple of bay leaves in the rice (deters insects)
I always heard that putting your rice and grains in the freezer for a couple of days before packing would get rid of insect eggs/larvae. But lately they seem to be saying that this might not be a great idea - something about what it does to moisture content - and that oxygen absorbers are better.