IF you can find one the Victorinox Alox Lumberjack folder is perfect for use in the PSP. Smaller and lighter than a Alox Farmer, with a main blade, saw and combo can and bottle opener tool.

I normally replace the scalpel blade in my PSP's with a very sharp Victorinox Alox Classic SAK or a Alox Lumberjack SAK. I've seen way too many people cut themselves very badly when try to use a scalpel with cold wet hands.

I usually EDC a Alox Farmer SAK and a nice Bark River fixed blade knife with me in a pocket pouch.