https://www.stanleytools.com/en-us/products/hand-tools/knives-blades/multi-tool/7-in-swivellock-utility-knife/10-989
This Stanly utility knife. Simple, not bulky, unlike most modern knives and very light weight. What I loooove about this thing is the time it takes to change blades. I can access the new blade inside the knife in less then 2 second. Change blade as fast as any utility knives and flip it back to normal operation within 2 seconds. no more looking for a screw driver or a nail. Press a button and flip and there it is.
LENOX Utility Blades
I make sure my guys all use only these blades (don't care what knife they use) because they are just that good, last much longer then the typical el cheapo at the home centers, usually the old stand by Stanley blades. Good stuff