Cardboard box

Calvin  often uses cardboard boxes for his different inventions, such as the Transmogrifier. and the Cerebral Enhance-O-Tron. It is thought by some that at least one box was the packaging for the Chocolate Frosted Sugar Bombs beanie. This, however, is unlikely, as the beanie box is significantly smaller than any of Calvin's inventions, and the Transmogrifier was invented before the beanie was ordered.

Inventions

 * Duplicator
 * Time Machine
 * Transmogrifier
 * Cerebral Enhance-O-Tron

Add-ons

 * Ethicator

Others

 * Sales counters
 * Location of emergency G.R.O.S.S . meetings
 * Package for Calvin to be mailed to Australia in