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

Made of VG-10 stainless steel, the saber ground blade comes in a PlainEdge configuration. This modified clip-point blade style is matched up with a purple, lightweight handle of fiberglass-reinforced nylon making the entire knife weigh only 0.6 of an ounce. The Ladybug 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 Ladybug3 packs tremendous cutting power and can take on both fine and heavy cutting tasks.

• Blade Length: Approximately 1.938" ~ 49 mm
• Blade Material: VG-10 Stainless Steel
• Blade Style: Saber Ground, Plain Edge
• Blade Thickness: Approximately 0.078" ~ 2 mm
• Lock Style: Back Lock
• Closed Overall Length: Approximately 2.438" ~ 62 mm
• Open Overall Length: Approximately 4.375" ~ 111 mm
• Handle Material: Purple Fiberglass Reinforced Nylon (FRN)
• Weight: Approximately 0.60 Ounces ~ 18 Grams
• Special Features:
  Lanyard Hole
  Made in Japan