I am sure there are lots of people out there with extra HDDs lying around that they have no use for. If some of those HDDs are of the 2.5-inch variety Sharkoon has a new external enclosure for you called the QuickStore Portable USB 3.0 enclosure.
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The enclosure will work with any 2.5-inch SATA HDD up to 9.5mm thick. It turns the drive into a USB 3.0 external storage drive once the drive is docked inside the plastic chassis. The chassis measures 135 x 85 x 14mm and is small enough to fit in a pocket.
The cover of the unit locks and can be had in three different finishes. Those finishes include brushed black, brushed silver, and mirror finish silver. The enclosure sells for 28.90 euros.