Low levels of oxygen can equate to low levels of spoilage. Oxygen-absorbing packets can be purchased from food storage specialty suppliers, and used inside your food containers. These are sold in a variety of sizes, and measured in CCs. In a quart jar of dry goods, you could use 50- to 100-CC packets. Use 50 CCs for rice, flour and mixes. Use 100 CCs for beans and pasta. In a 5-gallon bucket, you’ll need about 1000 CCs. Use more than that (around 1500 CCs) if the bucket is full of beans or pasta. That’s a hell of a lot of pasta, up to 35 pounds worth, and more than 60,000 calories on average.