Tonight I ordered 100 gallon sized mylar bags, along with 100 O2 absorbers, as mentioned in my last post. We'll put some of the rice I purchased on Monday in canisters but at least half of it will get sealed in the bags to stay fresh until we get to eating it. I'll have plenty of bags left over, which I plan to fill with other bulk foods to be purchased in the near future.
I ordered the bags and O2 absorbers from Sorbent Systems. They have a page here which shows how to seal the bags using a regular iron, for those of us without commercial grade sealers.