Sir/madam, have you ever tried an Osprey that suspends the weight of the bag off of your back with a sturdy piece of mesh and very minimal metal internal frame?[1] (I think Osprey pioneered this, other manufacturers now have it too). It has been life changing for me. I use it daily for commuting, and just finished 3-week tour through 3 countries with laptop, Kindle, and everything else packed inside this one bag. I’m sure Osprey has smaller versions if 34L is too much.
[1] https://www.osprey.com/us/en/product/tropos-TROPOSF19.html