Pocket Pop! Therizinosaurus - Keychain - Jurassic World Dominion. Pocket Pop! Keychains are collectable miniaturized Pop!'s. Each Pocket Pop! Keychain is 1.5" tall and comes on a key ring. These collectible Pocket Pop! Keychains have all the same features as your standard Pop!'s, but are shrunk down to fit comfortably in your pocket!