Oh... almost forget, that bag can double up as a computer bag too, fit a 14" laptop easily. It is now my work bag too.
A camera bag is an intimate and personal thing, at least to me. Which is why I find it hard to recommend bags to friends... I like the Hadley Pro but I can imagine people who do birding will not find it very useful after all.
Billingham, TTP, Lowepro, etc etc etc just get whatever works for you based on whatever your criteria is. All bags will definitely last for at least a while after all.