I am looking for SLING STYLE BACKPACK Recommendations

Ok, so my old backpack is on its last legs, lasted almost 15 years of heavy use. I am going to be using planes a lot this time around so I decided on 7kg total in a sling backpack, single strap. Problem I am encountering is I'd like one that is just under 55 cm which can easily fit 17.3" laptop safely, which I will have no issue taking as carryon regardless of airline I use.

I literally went though maybe 200-250 different product specs that various AIs suggested and it went nowhere. Its either too small, or looks like a laptop carrying bag, while I travel light and try to look like a NATIVE and NOT like a tourist. So nothing that makes it obvious there is a laptop inside, or that looks like backpacker type. This is probably suboptimal example but something like Tom Clancy's Sam Fisher sling backpack from Conviction (it's a video game, and very old one at that, but its best I got as reference point).

I did find many where look is ok, issue is that they are always lot smaller OR lot heavier (1.5kg for this bag is insanity, I'd like 600 grams or under for bag as it all has to be total under 7kg). If anyone has decent suggestions, thank you in advance.