I purchased a BBB2 SLR bag a month ago from Stephen and have been using it almost continuously since receipt. I just wanted to share my impression of it.
I do not load my bag up with lots of gear, but just put in what I would need for an outing. There are 2 wide pockets inside of the bag on each side with an alley down the middle lengthwise. If you can't visualize it, just take a look at the pictures on Stephen's website.
Inside the alley sits my Nikon F6 with an RRS L Plate attached, no lens, placed lengthwise in the bag. There is another 3 plus inches to the top of the bag, so it's fairly tall, and an additional 3 inches of room from the camera to the edge of the bag. Easily fits the F6 with the MB-40 vertical grip attached if needed. Nice and roomy. In pocket #1 sits a Sekonic lightmeter. Pocket #2 has a Zeiss 35/2 lens with reversed hood. These pockets are on the side of the bag nearest your body. Pocket #3 has a Nikon 85/1.4 lens with reversed hood. Pocket #4 has the film in their plastic canisters. These pockets are on the side away from the body. There are also 2 fairly roomy pockets on the outside of the bag that are covered by the flap when it is lowered. One pocket has a polarizer and ND filters, the other pocket has my keys and cell phone. There is one more long pocket on the outside of the bag that sits against your body. Not really good for bulky gear, more designed for maps, a magazine or newspaper.
The unique thing about the BBB2 bag is the way it hugs your body, much like the way a clingy toddler moulds itself to Mom. The bag wraps around my hips so there is no bag bounce when walking or jogging to catch the bus. With the strap worn cross-chest like a messenger bag, it becomes very comfortable and can be worn all day.
The bag is fairly weather resistant. I
have been in the rain and been caught in three heavy thundershowers and everything inside the bag stayed nice and dry. Other owners here at RFF have noted how the bag keeps out snow and sleet.
One thing I wanted to try was to see how comfortable the bag was when it was loaded up with LOTS of gear. I don't own any zoom lenses but placed all my heavy primes (not the plastic modern ones, but the older heavy metal manual lenses) in each pocket along with the camera body, flash gear and lots of spare batteries. Sorry, not comfortable at all. The unpadded strap cuts into your neck and shoulder and after a short while was a real pain. As a day bag, the BBB2 is perfect for me. As a fly cross-country with all your needed gear and work out of bag, not so good.
One personal item I did not care for was the long strips of Velcro used to keep the flap in place. I am not a fan of Velcro, and this bag has 4 inches of it on each side of the flap. Every time you open the bag, a very loud "keerrriiipp" that can wake the dead. I made a quick trip to the fabric store to buy more Velcro to cover the strips. A little adjustment to cover the upper 3 inches and now the bag opens with a barely heard "snik". As I said, just a personal thing that most other people would not be bothered by.
As a side note, I have received many compliments on the way the bag looks, especially from the ladies. When I show them that it is not a messenger bag but a camera bag, then they become really interested and ask where to go to buy one.
Overall, I think the BBB2 is well designed and well worth my investment.
Best Wishes!