Ok. Finally BBP slingbag arrives, and have been using it for a month.
Let me tell you that I love it. It is a medium size bag, but holds everything I need for a trip: Mi k-x, with a lens attached, my old tokina 80-200, my all terrain: takumar 18-200, a 28 M42, my favorite M50 f1.4 and my takumar 135, plus my flash, cleaning kit and macro rings.
It is super comfortable once you use the waist strap over your pants belt.
On the lower compartment I carry 8 to 12 AA batteries.
I highly recommend it.
Regards to all