I use this method for leftovers from #10 cans. Dried carrots, celery, onions, powered milk, mac and cheese, etc. I still open them on occasion when I've needed a handful, then sealed them back up again. I can't speak to oxygen degradation, but it keeps air moisture from turning them into a solid mass in a month. I've had the carrots and such in jars for at least 18 months and they're still fine.
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