If I had to live in a horrible world where I was limited to one bag, it would certainly be the Hadley Pro. The For Leica and the Hadley small are both excellent when you want to go smaller and lighter, and with less gear, they are just layed out a bit differently. I really like having the two front pockets on the Hadleys, but I find it a bit annoying that you cannot put the Avea pouches on the Hadley small, but you can on the for Leica. It's also nice to have the excuse of different colors for the different bags, that can help make your daily choice. I am waiting for a Fogg b-laika to come next week. A bit pricey, but I got mine used. I have borrowed one form a friend and they just seem a bit softer and more compliant than the Billinghams. The only objection I have to the Fogg bags, other than the price, is the use of Velcro, I cannot stand velro on a bag. Especially since it will one day wear out and it s a bit harder to replace, but then again, my dry cleaner is also an excellent tailor and enjoys a challenge. I think that I am starting to sound bag-obsessed, a label that I will have to bear. I will put it on the shelf with my bags!