Ammo storage questions.

I want to store some ammo. Id like to at least have a standard size ammo can of 9mm, 7.62 and 12 gauge stored.

If I have a ammo can in good condition with the rubber strip in good shape, put the ammo inside of ziplock bags is that enough to keep them stored in like a basement storage room that is dry and cool? Or should I be doing something different in order to insure their longevity?

Also curious how long you can store ammo before it starts to lose its potency?

Basically I am just wanting to keep a small stock of ammo for 3 primary types of ammo for my guns as a "just incase everything goes tits up" backup.

Thanks.

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