I have carried this tiny knife for a few years, connected to a Photon Freedom micro light (another cool tool I heartily recommend over the oft recommended Microlight II) for the world’s smallest EDC (Every Day Carry) set. A knife and light combo will cover 95% of any odd daily task I encounter while working in an office and lab environment. This knife is the perfect size for professional office dress. It disappears in my pocket until I need it.
It is the smallest knife I have ever found and is just big enough for general scraping, tiny hole poking, and little thing slicing you need to do on a daily basis. It does not have a lock mechanism, but as long as you know that, you can use it in a way that will not cause it to close. It is stainless steel, so it is tough and corrosion resistant.
I recently lost my Bug knife and confirmed what I already knew: that I could not do without it for even a week. It costs only $6 (plus $4 shipping) at Lighthound.com ($12 on Amazon) so it is a bargain.
-- Mark Nordhaus
Spyderco Bug knife
Available from Amazon