Someone mentioned pin storage I use mules to store my extra pins and costumes.
I have a nule for pink dresses, one for yellow, one for cowboy etc. Sadly I started out with 30 pieces of each costume and I am almost out of some of them.
Then I have one mule with junk pins and other that keeps all of my popular pins. I keep 3-8 of each pin on me. I like to wear all 8 identical pins so for the really rare pins I have 8 and the more current like quest, haunted, hotels etc, I only keep 3.
Everything else goes on my main mule. I trade back and forth as I need and buy things.