Now I know this is a BIG no-no on this site BUT I've been medically deferred for whiplash and need to walk for roughly 10 miles a week with weight on my back for 3 months (and keep a log) in order to have my application continued.. I obviously pack the weight in with loads of towels and things like that but my shoulders always feel as if I'm being pulled backwards.. and the bag is as tight to my back as it can possibly be? Plus my shoulders are knackered after it.. Am I doing something wrong? I just want the most efficient way really so I don't do myself an injury.. Weight at top or bottom? Closest to my back or furthest away? Many thanks..