This little container for SD cards has a sliding lid with latching detents to hold it in place. It's a nice little idea and I had seen someone with one at a maker faire before. MDF is a fairly nasty material for these things as soon as I push the lid into place the detents actually tore slightly (the bottom photo shows the weak points). The case I saw at the faire was actually one of these remix cases made in acrylic which is a better material and the detents are about 50% longer. Because the originals aren't shared in the svg file format I took the liberty of extending the detents in my copy of the file. (svg here)
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