What to store in pump house?

We just had a new pump house built and there's quite a bit of room for...something. But with the high humidity, I can't figure out what I should put in there! No canned food. 5-gal buckets have metal handles, although I could remove those in storage, but would the humidity bother anything in a sealed bucket? Then I was thinking maybe vacuum sealed spare clothes, but what a nightmare if the seal was faulty and the moisture got in. Any ideas?