Actually, yes there are! I think I found about 20 of them when looking for "reference material" on camera movements!
Yeah, I don't see how one can wear the bag while carrying a backpack. I don't think they are intended for that, however, I think the concept is: set your pack/bag down, unpack, set up camera and wear the belt pouch while shooting, rather than having to go back and forth to the bag for all the little bits and pieces.
My guess is that they don't bring it to production. Last night they (Think Tank) told me that one of their other bags can hold 4x5 holders if you strip out the padding. A Mountainsmith fanny pack will probably accomplish the same thing.
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