For anyone else with shoulder problems wondering about using a crossbody strap to wear your bag as a backpack: I tried it out with the longest crossbody strap I have already—50”—and if you have narrow shoulders and good shoulder mobility, it could work. For my narrow shoulders and not great mobility, a longer strap, like 60”, will probably be easier to get into and out of. At 5’3” with an average-length torso, the “slide the strap down around your waist and flip the bag back over your head” method did a better job of keeping it higher up on my back instead of my butt while walking, but was a little harder to get into and out of than the “thread the strap through the top handles” method. Finally, the strap adjustment hardware ended up in an uncomfortable spot. So YMMV, but I plan to try this out longer term with a bag that has a fully enclosed top to keep things from falling out, using a 60” nonadjustable strap from an Etsy vendor. I’ll upgrade to a nicer quality strap if it works long run.