<< What shouldn't be in a cache?
Use your common sense in most cases. Explosives, ammo, drugs, and alcohol shouldn't be placed in a cache. Respect the local laws. All ages of people hide and seek caches, so use some thought before placing an item into a cache.
Food items are always a bad idea. Animals have better noses than humans, and in some cases caches have been chewed through and destroyed because of food items in a cache.
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Darn I was hoping to find a bottle of booze