Flat, then made up
Archive boxes are supplied flat, with an integral lid, and the sides become triple thickness once they are made up. Removal cartons are the same idea: you make the cube up, then fill it.
Wardrobe boxes include a plastic hanging rail. The sizes listed for them are internal: length, width, then height.
Tape is not in the carton
The rail is part of the wardrobe box. The tape is a separate line. Order it in the same basket if the move needs both.