Did a troop in my sandy for the first time, was only a 2 hour troop collecting for charity, however at the end of it my shoulders were very sore and aching, the straps and just canvas, i also get the backplate digging into my upper shoulder blades, i saw a thread where someone had added a chest strap too the backpack too but the photos were deleted, i also wondered if i could just buy a backpack, cut and e6000 them onto the canvas for comfort, thanks for reading and all help appreciated