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. However, the downside of a Bag is that as more things get put into it, other things that were in before or don't get used very often get pushed further and further down, to the point where the Agent needing something they put in there several years ago will need to take a torch and actually climb in, perhaps with signal flares or at the very least, roped at the waist so that their partner can pull them out in the event of a mishap. What? You didn't expect it to just be a handy Deus ex machina, did you?

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