For the record, I freely admit to being a geek, from my earliest days as a mechanical engineering student, gadget freak, and Star Trek aficionado (no, not "Trekkie"--I prefer "Trekker").
Now, part of the deal with being a card-carrying geek (no, no--there aren't really cards) is a familiarity with Dungeons & Dragons. For those not quite familiar with the concept, D&D is an analog precursor to MMORPGs (Massively-Multiplayer Online Role-Playing Games) like World of Warcraft. The difference is that D&D isn't quite so massive--maybe six players at a time--and no computers; we relied on deadtree material (books), charts, and multisided dice.
One of the more enviable accessories (and, let's face it, accessorization is what separates us from the lower species) in D&D is the legendary bag of holding. According to Wikipedia:
While it appears to be a common cloth sack of about 2 by 4 feet (0.6 by 1.2 m) in size, it opens into a nondimensional space (similar to magic satchel), making its inside larger than its outside dimensions. Each bag always weighs the same amount, between 15 and 60 pounds (7 and 27 kg), regardless of what is put into it. It can store a combined weight of up to forty times its own weight, and a combined volume of 30 to 250 cubic feet (0.8 to 7 m³). Even if the bag is filled to capacity the objects inside never damage or even touch one another, which means that a character could fill a bag of holding full of eggs and weapons, for example, without any fear of breaking the eggs. A living creature put in a bag of holding will suffocate ten minutes later.
ThinkGeek offers a 21st-century equivalent that's equally stylish, not quite so magical, but tastefully decorated with the D&D aficionado's classic tool: a 20-sided die.