If you are storing ammo for long term you probably know it needs to be stored with desiccant to keep moisture out of the box it is stored in. Those little desiccant packs can be expensive to buy but Doc Faulken has a diy project to make your own desiccant packs.
MTM Ammo Can (Forest Green)
MTM Forest Green 50 Caliber Ammo Storage Can
MTM 30 Caliber Ammo Can (Forest Green)
Amazing Cat Litter – 8 lbs.
Clear Choice Silica Crystals Cat Litter Bag, 4-Pound