Next time you are in a place where you can watch the world walk by, put your attention on how people carry things and how this affects the body.
Over the shoulder bags tilt the shoulders noticeably and alarmingly.
Hand held heavy items tilt the entire body and the feet splay to balance.
Babies on hips cause a camel sway and this is particularly noticeable to me now because of Grandbaby and my initial, instinctive plopping of him onto my left hip where I carried his Dad and his two brothers. It felt familiar - but in a scar tissue sort of way.
A chiropractor once told me that much back distress blamed on beds and chairs could be eased if not cured by switching from purses and briefcases to back packs.