The Victorinox Midnight Manager has to be the neatest little knife going. It’s the ultimate keychain item for me. This darn thing has a light, cap-opener, philips screwdriver and ballpoint pen and, of course, “much more.” Oh yeah! And it’s cheap. Check it out!
https://www.amazon.com/exec/obidos/ASIN/B00011SMCG/jeffpottersoutyo/103-9955619-9204642