Although it rides on my keychain, I would consider the Spyderco Ladybug for a small PSK. Weighs only 1/2 ounce and is 2.5" closed. It is a fierce little cutter with a locking blade that far outdoes the SAK Classic as a micro sharp. (Though perhaps if I were in strictly urban mode I still might take the SAK Classic with the built-in pen - I use that feature a lot!)<br><br>Here's the spec sheet over at Spyderco:<br><br>http://www.spyderco.com/dealer_product_info.asp?sts=10%2F5%2F2002+12%3A27%3A09+PM&pfid=LB&deptId=1010&mscssid=PVH7C8BL9R9L9PEU8Q3MHH8LPA9X0R89