This insert holds all the hero pack expansions along with the Dragon expansion. It is also designed to hold the upgraded minion miniatures (by removing the orginal). It will, however, hold all the different bosses.  The expansions have you remove cards and this is considered with the design of this insert. Due to the high quality of the cards, this insert was not designed to hold sleeeved cards. It comes with (3) removable trays for various components. (Game not included)