This knife measures 2.875 inches when it's open and only 1.625 inches when it's closed.
The bug knife is the smallest knife in spyderco's product line. It's made of stainless steel and it has no locking mechanism to hold the blade open. The blade stays open by the pressure applied when used. It only weighs about .4 ounces and has a hole in it for you to slip a lanyard through it to tie it to something so it doesn't get lost.