Russian designer Dima Komissarov, whose clients include UNO and Yukos, has designed a USB Flash Drive with in-builtmicro pump. The size (or volume) of the USB drive changes depending on the amount of data it holds.

The picture here shows the two states of Flashbag USB drive - one is empty while the other one has data stored inside. When the device is about to blow up you will see the familiar error message on your screen: "There is not enough free space".

When swithched off the flashbag remains pumped up, so you can estimate with the naked eye how much more pics, books and music albums can be transferred into it.

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See more examples: FlashBag