Who lives in a pineapple on your backpack? The Loungefly® SpongeBob SquarePants Mystery Mini Backpack Keychain Charm is a blind-box collectible shaped like a mini backpack with Bikini Bottom character graphics that clips onto bags, lanyards, and keys for fans who love surprise collectibles. Each mystery charm features detailed artwork and a functional mini zipper that makes it feel like a real tiny backpack. Trade with friends to collect them all.