In reply to dr_botnik:
Hi,
It depends on how lightweight your gear is. I think you'll struggle to get all that in a bum bag.
If you have to put gear on then you have to stop so its no extra hassle getting out of/into shoulder straps.
I carry waterproof jacket, Synthetic vest, survival bag, a few plasters, mobile phone and a bit of food in my 5ltr Lowe alpine bumbag, it didn't seem to moved around a lot on a 40k run i did a few months back.
I always use this stuff
http://www.evanscycles.com/products/body-glide/original-anti-chafe-balm-128...
just whack it on any skin that's going to be rubbed against. It awesome.
Post edited at 19:48