Marvel Tales #129

A mysterious jacket has a spell on it that compels any who wear to stuff objects into the bottomless right pocket. A scientist figures he can get rich if he can figure out the secret of the other dimension and tries inserting various objects, even a note attempting to communicate, but he cannot figure out what object the other dimensional beings are looking for. Finally, he sticks his head in attempting to see, and falls all the way in. When the jacket is found the next day, the pocket now has a bottom sewn in.