Bill, I only use a bag to go from home to a destination and not as a daily carry all, I use a photographers vest by Domke for that, lots of large pockets plenty of room for bits and pieces. Also it distributes any weight around the body plus if I buy something I've got room to add it to a pocket. I get the belt idea but for this fat old geezer I don't think it is a good idea!
This is my second Hadley, I had an original one from way back in the 1970s, eventually the strap frayed to bits, yes I know Billingham will do repairs but decided one a little bit bigger would be best and I liked the Sage green colour. This original Hadley went though a washing machine at least twice with no apparent harm!
Love the greek survivor!