When you think of the classic Swiss Army Knife, you likely envision the common 91mm version. That's the size that became the standard in the 1950s. As ubiquitous as this line is, the strange thing is that Victorinox never updated them with clips, which became popular with other folding knives starting in the 1980s. So if you've got a 91mm SAK, you either fish for it in a pocket, or attach a lanyard to its key ring. Now Tortoise Gear, a licensed accessory maker for Victorinox, is rectifying the omission. Their Lamprey91 is an add-on clip that you can install without disassembling the knife. The clip slides into the thin seam between the handle and internal metal liner, than seats around one of the knife's concealed rivets. Here inventor and Tortoise Gear founder Eric McCormick demonstrates how to install it: That's an impressive piece of remedial design! The Lamprey91 has been successfully Kickstarted, with 23 days left to pledge at press time. They run $25 and are expected to ship in February.

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