Cygnus Potter's Trunk

Cygnus Potter owns an especially bewitched magical trunk. It has seven locks on it, and the trunk opens to a different assortment of objects for each lock. The first compartment contains a mass of spellbooks. The second contains an assortment of broken Sneakoscopes, parchments, quills, and two invisibility cloaks. Most notably, though, the seventh compartment is about 10 feet deep, because of the use of an Undetectable Extension Charm.