Please enjoy this nerdy and perhaps selfish wishlist of the exact tools for different size SAK's that I've been working on ;-)
I gather there are others here that have similar lists?
So... perfection is a filthy lie! Centurion, Explorer, One Handed Trekker, S557, Cybertool 29 and many others come close, but noooooo!
One reading note: It's always good to have more tools in the given length and layer combination; it's not to dismiss tools like our beloved hook!
Two Layer (85/91mm):
Main Tools> Lock blade; nail file/cleaner; bottle opener/screwdriver; can opener/screwdriver
Back Tools> Phillips Head Screwdriver; awl.
Scale Tools> Tweezers; toothpick; pen.
Two Layer (111/130mm):
Main Tools> One handed opening lock blade; bottle opener/screwdriver; can opener/screwdriver
Back Tools> Phillips Head Screwdriver; awl.
Scale Tools> Tweezers; toothpick; pen.
Three Layer (85/91mm):
Main Tools> Lock blade; nail file/cleaner; bottle opener/screwdriver; can opener/screwdriver; scissors
Back Tools> Phillips Head screwdriver; awl.
Scale Tools> Tweezers; toothpick; pen.
Three Layer (111/130mm):
Main Tools> One handed opening lock blade; lock bottle opener/screwdriver; can opener/screwdriver; scissors; Phillips Head screwdriver
Back Tools> Corkscrew with mini screwdriver; awl.
Scale Tools> Tweezers; toothpick; pen.
Four Layer (85/91mm):
Main Tools> Lock blade; nail file/cleaner, bottle opener/screwdriver; can opener/screwdriver; scissors; Phillips Head screwdriver; magnifying glass OR LED light
Back Tools> Corkscrew with mini screwdriver; awl.
Scale Tools> Tweezers; toothpick; pen.
Five Layer (85/91mm):
Main Tools> Lock blade; nail file/cleaner, bottle opener/screwdriver; can opener/screwdriver; scissors; Phillips Head screwdriver; magnifying glass OR LED light; bit driver with bit carrier
Back Tools> Corkscrew with mini screwdriver; awl.
Scale Tools> Tweezers; toothpick; pen.
I max out here as it hits 'too big for pocket EDC carry' :-)