I stored a lot of stuff after I finished grad school and before I moved half-way across the country to a new job. Stored stuff for 3 months, if I recall.
When I opened it again, the rug had mice nests in it, other stuff was moldy, and in general I thought "What in God's name was I THINKING to pay good money to store this crap??"
Lesson learned. If I have to pay to store something, that means it is not doing my current life any good and I should sell it, give it to Goodwill, put it out with the trash, whatever. I will never pay good money to store anything ever again.