A few years ago I started storing my .22LR in soda bottles. A 20 ounce soda bottle holds 500 rounds perfectly. It keeps the ammo handy and very dry. I like using the wide mouth Snapple bottles.
I even ran a test, keeping some in my aquarium for two months and it was still dry.
I have been shooting my old .22 recently. I picked the bottle based on the most tarnished ammo.
--From now on I will put a date on the bottle. If I ever find any to buy again...