It sounds like you need a plain old rucksack with a sternum strap or a messenger bag with a stabilizer strap. My only caveat while on pavement is to avoid anything with to many outside compartments that can be accessed by someone else without your knowledge. I usually gravitate toward a tote, satchel, or ruck for carrying stuff on pavement, but I'm also just walking. I like the convenience of a messenger/sling bag, but I can't tolerate any pressure against the side of my neck.