Stuffwell is a character in the game Mario & Luigi: Partners in Time. He was made by Professor E. Gadd and given to Mario and Luigi to help them out during the game. He has a suitcase-like appearance and he carries the Mario Bros.' items, passports, gear, etc. Stuffwell's main catchprase is "BACK TO ADVENTURE!" He also has a strange habit of making his own words up.
Stuffwell replaces the plain suitcase from Mario & Luigi: Superstar Saga, but the only difference between them is that Stuffwell can talk and appears to be an alive suitcase with robotic features.