Look what I just got in the post

This machine calculates the size of each order and then folds the cardboard box to fit

From Chain Reaction Cycles - behind the scenes

The company only have two sizes of cardboard box. Orders are put into one or the other, depending on size, and the lid is left open. The box then enters an amazing machine which works out the size of the order and custom scores and folds the box to fit. A postage label is then affixed and the package is ready to be dispatched.