Bag

The Bag is an invention of Makes-Things', adapted from Mary Poppins' carpet bag. It can contain anything, including things a lot bigger than you'd think possible; Agent Montbretia swears she's got a particle accelarator in hers, whereas Agent Trojie is known to keep full sets of J.R.R. Tolkien and J. K. Rowling's works, a stereo, a life-size cardboard cutout of Kurt Cobain and a porcelain kitchen sink in hers, as well as her exorcism kit. The Bag is thus an extremely handy gadget, and it is odd that more Agents don't use them.

Agent Tasmin's duffel bag may seem like it is The Bag. She, however, claims this is due to smart packing.