Students at Canada's Simon Fraser University designed this cool purse called the Ladybag that can detect its contents and alert the owner when something is missing:
To design the purse, the students used off-the-shelf technology. Into the bottom of the bag they embedded a radio frequency identification reader, which is powered by a nine-volt battery.
They wired the reader to a screen-like panel in the front of the bag, which contains three patterns of light-emitting diodes.
Each pattern is an icon representing an essential item that the owner does not want to leave home without. In the prototype, these items are a set of keys, a wallet, and a cell phone.
Lastly, they attached an RFID sensor to each of those items.
As long as each item is missing from the Ladybag, its corresponding icon lights up. As the keys, phone, and wallet are each placed into the tote, the icon blinks off.