My back feels better hiking with a backpack than without one. There are probably several reasons for this. One of the reasons occurred to me as I was walking home from Safeway today with about 35 lbs of essential groceries (granola + beer).
I typically rest my arms on the front bag or hang them from webbing attached to the top corners of the pack frame. So part of my arm weight is transferred to my waist (through the frame), thereby taking some load off my spine. Most of the pack weight and its contents are also transferred to my waist. (The shoulder straps attach to the frame above my shoulders and don't touch my shoulder tops.)
Here are some photos of a typical senior athlete to illustrate. (for size reference there is a 30 pack of 12 ounce Natty Light Beer in the back and 3 two pound boxes of Northern Gold Granola in the front.) Pack is of the myog variety.




Next challenge will be to transfer the weight of my heavy bulbous head to my waist.


