SHOULDER BAGS A STRAIN FOR KIDS
Shoulder bags are fashionable items for students heading back to school, but a heavily loaded bag supported by a single shoulder strap is a bad idea, chiropractors warn.
Ref. https://www.cbc.ca/story/health/national/20...bag-straps.html
I remember this was first publicized when I was in high school. Stories about how heavy bags for kids could be bad for a childs back and spine in both the short term and the long term. We have a two strap back back and try not to load our son down with books and such. If we need to, we send him to school with a second bag or take it up to him separately so he doesn't struggle and strain with it. He has a sway back so its especially important for him.