Who here has taken a generic bag and re-purposed it for camera bag use?
I did just that for my Leica M kit and it's the best camera bag I've found for it yet.
While grabbing luggage for a quick weekend trip to Miami, my old Tumi 5123D T-TECH bag fell out of the closet. Hey, look! Black with red interior!

Anyway, i noticed it's a similar size to the Crumpler 4 Million Dollar Home I had JUST bought a few days earlier. Then I remembered I had an Artisan & Artist bag that had a removable divider in it, and when I dug that up the divider JUST fit in the Tumi. The A&A bag was the same height as the divider, but as you can see in the pics, the Tumi is taller, allowing the M to fit lens down above it, giving me more storage space.
Some other things that work out better about this bag are...
1. Zippered main compartment access. This is easier to work out of than a flap-top bag.
2. The material is tough yet flexible and the bag as a whole is not as "tight" as the Crumpler. Crumpler makes getting into it's various pockets a downright chore.
3. Comfortable. The bag really hugs the body when worn cross-body like I wear all my camera bags. Rotating it front to back is easy, and it never gets in the way, even in tight crowds. Lack of a shoulder pad was no problem at all, although if I wanted to I could add one.
4. Really doesn't look like a camera bag... because it's not a camera bag! Looks like any old man purse because that's what it is. No one would expect it to house $11k in camera gear.
5. Lots of pockets. More than most camera specific bags I've had.
6. Looks good (subjective). Some camera-specific bags are downright ugly.
7. Size. It's small and NOT BULKY. That's one of my biggest complaints about camera specific bags. Many are overly bulky which leads to issues with comfort, how it hangs on the body, how tight the compartments are and overall size.
8. Worked great for travel. I was able to hold various non-camera items in the different pockets like my phone, wallet, boarding pass, headphones, kindle and if I wanted to stretch it, i could have shoved my ipad in the back pocket but instead i put that in the back pocket of my backpack I was using for my clothes.
So there you have it. This bag traveled through the airports, up and down the beaches and streets of Miami, never got a second glance from anyone and it performed better than any small camera bag I've owned yet. And I'm not far behind Abel in the amount of bags I've owned/own. Just goes to show that if you are searching for the perfect camera bag, maybe you are looking in the wrong place? There's lots of great bags out there and inserts from the big bag makers are readily available if you don't have any of your own to spare. If you've successfully re-purposed a non-camera bag, feel free to post here!
BTW, if you are not familiar with Tumi, have a look. They make some of the best bags from construction to design. And there is a serial number riveted to every bag. Who knows... if you loose it, that's just one more chance it might get returned to you.
