Backpack

Trunk sees Simon going for a walk carrying Pupster in his backpack. She sneaks behind Simon, wanting Pupster to play with her. But when Munki tries to put Pupster back into the backpack, he accidentally gets picked up and shoved into it instead. Simon doesn't know he's carrying Munki instead of Pupster, and Trunk has to do whatever she can to rescue her friend before Simon finds out.