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I use a simple rule when I pack food in Mylar bags and buckets. If it is a number 10 metal can or a one-gallon Mylar bag, I use a 300 cc oxygen absorber. In all the packaging I write about, I will use the 300 cc O2 absorber. The reason is I get them from an LDS cannery that is convenient for me, and that is the only size they carry. My rule is one absorber per gallon, regardless of what the product is. In other words a five-gallon bucket with a large Mylar bag filling it would take five absorbers.
To read all about o2 absorbers, and see great charts on how many you really need to keep food safe and preserved below