The shelf life of the oats has a lot to do with their packaging; for instance, if they are packed using paper, humidity and airborne yeast can enter the bag and spoil the oats.You’ll need oxygen absorbers specifically designed for food preservation. You also need to consider the packaging size and type. A rough estimate is that 500g of oats (dense food) will require 50–100 CCs of Oxyg... https://www.oxygen-absorbers.com/blog/how-oxygen-absorber-prevent-oats-from-turning-rancid