Slice the cylinder and make it a circle. Stanislav Tatarinov previously created this sweet Cryptex USB flash drive, a functional puzzle with rotating Cryptex rings and numbers whose user-set code slides out a 16GB memory stick. His latest version operates under a similar premise and steampunk aesthetic, with a flatter disc design whose locking mechanism is controlled with rotating gears.
The flash drive has 4 gears cryptex owners must position correctly to access the internal 16GB of USB storage. It's made of solid metal and measures 2.2" x 2.5" x 0.4".