When you travel through time and space, it's nice to have someplace to keep your stuff. For instance, a jewelry box that's bigger on the inside could be quite nice. This one? Not bigger on the inside. At least not the one we tested out here. It also only traveled through time forward, and only at one second intervals.
But it is a great place to store your jewelry. You wouldn't want your jewelry galavanting off through time and space without you, right? Now most of these don't exist as jewelry any more, but if they did, this jewelry box could hold the Firestone, the Great Seal of Diplos, River's earring with the Callisto Pulse inside, your bracelet that protects you from the Dalek Asylum's nanocloud, any bio-damper pieces you might own, and your free-with-purchase Adipose Industries pendant (what a deal!).