Marbles MR278 "GI UTILITY KNIFE" (AKA: "Demo Knife") (under $8.⁰⁰) 100% 440A. Like the Camillus, Western, Colonial, and other makers of the old issue "Demo Knife", the bail is "strong enough to tow a Jeep".
Differences: The MR278 has match strike pulls, the can opener blade lacks the "CAN OPENER" stamp, and the MR287 is about 1/16 inch shorter closed. Blade lengths are the same, however.
I don't know it it is true or not, but I was told by a member here a couple years ago the MR278 is current Mil Spec for the Demo Knife. I don't know anyone currently in the military, so I don't know if the quartermaster is handing them out, or the government still has warehouses filled with New Old Stock Camillus/other contractors Demo Knives to give out.
SAK: (4 blade no back tools) Recruit (Personally I find the pen blade handier than the Cadet's fingernail file) and it has the toothpick and tweezers.
Evo Grip 10; 14; 17 with multi purpose corkscrew. The 18 if you want the single purpose phillips screwdriver.
Huntsman/Field Master, if you want scissors and saw.
Vintage: Ulster, NYKC, Camillus, Kamp King, Diamond Edge, Colonial, Imperial, Marbles Gladstone, MI. Hammer Brand ... I think pretty much everyone (I believe Buck was an exception) made a 4 blade scout/camp or Engineers Knife. (Engineers knife has a pen blade instead of the punch/awl/reamer 4th blade)