Hi, Jodi!
For quick access (and secure keeping of!) your Key to the World and your PhotoPass card, I'd recommend one of the many
lanyard pouches available ti the Parks and related Resort shops. This is a credit-card-sized plastic sleeve that has a zip top and uses a carbiner clip to hook onto a
lanyard, also available in a huge variety of colors, prints, characters, etc. You will have no trouble finding these popular items, as they are perfect for displaying your favorite pins (those to trade and those to keep!).
A few pin and pass keeper options are available that clip on to a pants pocket; these are a little less immediately available as they have just started to roll out. I'd recommend sticking with the traditional around-the-neck lanyard, though, as they offer the higher level of accessability.
See you later, celebrator!
-Deborah B.