This looks pretty much like my 6.5 year old High Sierra backpack - black, heavy enough nylon/canvas that it does not show wear, padded computer sleeve big enough for my 15" portable second screen, additional sleeve for 13" laptop, roomy enough for tablet and the accoutrements needed for running Zooms from my hotel room - external speaker, outlet extender, etc., four separate compartments make it easy to find things and a quick minipocket for stashing phone, passport, COVID cards, etc. 40L capacity. And still looks reasonably professional. Under $50:
https://smile.amazon.com/High-Sierra...dp/B000OZCDGK/ (Has doubled as weekend hiking trip bag, beach bag, room for SLR kit AND binocs, etc. as needed and still doesn't show wear)
Newer versions with different materials advertise only 36.5L capacity so YMMV.