Very strange. Here is my reply to a similar query today on CPF.
Re: Male purses
We prefer saying survival satchel, man bag, tough tote, preparedness pouch, rough-guy rucksack, all purpose attaché, shoulder saddlebag, curio hopper, hunky haversack, danger duffel, homo sapiens holdall, crisis clutch, hetero handbag, or male carryall to the term "male purses".
Not that there's anything wrong with that... (Seinfeld)
Now that we are clear, here are my suggestions. Look for the modest sized shoulder bags designed for airline travel. The small bags that are meant as organizers for your tickets, travel info, maps, etc. Modest in size, but plenty of pockets/compartments for decent organization. I'm not really into the" urban-commando" look, so I avoid most of the military/police type bags. I'm more of a "suburban stealth" kinda guy. I'd prefer just to blend in with the rest of the huddled masses.
My current shoulder bag was made by GH Bass, but it looks like they have gone back to just making shoes (unless someone knows differently).
TR (currently preparing his “nouveau knapsack")