In the market for a backpack? Making your own backpacks? Maybe you're even a cottage manufacturer? Lets see if you can spot the difference in those backpack designs.

We don't have square shoulders. Yet everyone is sewing their shoulder straps on at 90 degrees. This kind of configuration, and the resultant weight distribution, can cause unnecessary soreness, numbness, and even permanent nerve damage.

Source.

The majority of my shoulder straps are sewn on at an angle. A comfortable angle. Two cottages and three major players get it right. Two cottages fail. But you only learn from failures, so now is a good time to learn how to properly attach shoulder straps.