Aaahhh, that makes sense and this also answers the question how they solved the taking off of the backpack without opening buckles etc.I use it without a backback. Makes for cooler carry in hot weather. It can be combined with any backpacK you choose.
Love it ! So because - in the terms of another appreciated member - I am "what can I find" type of shooter quite often, this allows me to have my smaller things for close-ups and ground work in a little backpack and can have this one in front.
If using straps and moving in terrain a little more difficult, I tend to be hesitant to leave my hands ioff the camera completely, especially with longer glass tending swing and I had a couple of occasions where it threw me over, because I didn't have the hand free. With this I would be really confident to use both hands for crawling/climbing and still have camera relatively safe in front of me rather than in the baclpack.
Thanks !