The thing I don't like about 1 strap bags is that they are unbalanced and make bending over a more thoughtful endeavour. I don't mind them for everyday urban life (my purse only has one strap) but won't use them again for off-roading.

In his book "When All Hell Breaks Loose" he makes a few differnet homemade packs, and did so on the show as well. I suspect he'd crank it up a notch if his was carrying more than EDC.