It attaches to your keychain and is nearly as small as your car keys, one of Spyderco's smallest lightweight locking knives is the Ladybug.

Made of VG-10 stainless steel, the hollow ground blade comes in a SpyderEdge or PlainEdge configuration. This modified clip-point blade style is matched up with a stainless steel handle perfect for engraving or embellishing. The LSS3 doesn't have a clip but rather a lanyard hole for attachment to a keychain or lanyard.

Like its larger counterparts (and all Spyderco knives) the Ladybug 3 packs tremendous cutting power and can take on both fine and heavy cutting tasks.