I get really painful muscle aches/cramps in my back (Shoulder Blade area) when wearing my Simms Vests but when I just put a couple of small boxes in my shirt pocket I am largely pain free.

Even using an English style shoulder bag is better for my back than wearing a Vest.

I'm wondering if any of you have had similar aches/pains experience and if so, have you tried a Filson Strap Vest and did that help any?
Did any other type vest help? I'm good with cutting down on the amount of "stuff" I carry.
Thanks,
Ken