Just my 2 cent :-)
I traveled all off June this year in England with my trusty old regular RS back pack (moving 11 times), but I also regularly hike at home with a back pack with a waist/hip belt (not sure which is which, but this belt is meant to take the weight off the shoulders).
I was glad I chose the back pack BECAUSE I was moving around a lot. I really really enjoy having my hands free, when I have to pay the bus driver, or when I have to climb a high train (getting less and less often these days. Most trains are low entry).
The waist/hip belt is supposed to lay on top of your hips, not pressing around them. I.e. a conical belt is better than a cylindrical belt. This took me years to learn :-(
The back pack should NOT contain any important stuff (money, camera, computer, passport, prescription medicin). You should be able to gate check it without fear of losing anything or risking anything breaking up. SImilarly with leaving it at your seat in the train to go to the restaurant car or the toilet. Or stashing it in the luggage department under a bus/coach.
Try a back pack with weight in it. Many shops will have them already weighted if you shop in the start of the season. But also try them out for as long a trip as you anticipate you will use it. Beware they don't give you pack for a short back, but being tall that should be a lesser problem for you. I'm short, but have a long back, the shortness is mainly in my legs, and I always get a pack which is too short :-(
For reference I'm male, 168 cm, 68 years.