If you spend a lot of time at LAN parties, or maybe have a dorm room with its door constantly open, you might be a little nervous about someone making off with your sweet new hundred dollar mouse or headphones. This accessory for your case lets you lock them into your case, preventing them from being unplugged and nicked by unscrupulous LANgoers or undergrads.
It’s quite a clever little design, though I wish they’d left enough room that you could also plug in a thumbdrive. USB expansion ports like these are a dime a dozen, but it might be worth it to pay an extra couple bucks (the Bunker is $25) for this capability.