I love my Dagne Dover backpack. It fits my laptop and has a ton of pockets:

https://www.dagnedover.com/collections/the-dakota-backpack

I also have this backpack and the black nylon looks clean and professional, but it's too small to be my everyday work bag:

https://www.amazon.com/dp/B07K7P1MKZ/ref=cm_sw_r_apan_i_MY8Q0HA8Q6NT01AT922A?_encoding=UTF8&psc=1