In my Kiboko bag lenses and Cameras are transported disengaged, in the Lowe long lens trekker engaged, in the Lowe Flipside AW both but mostly disengaged.
when I carry the equipment outside its mostly engaged.
Beware that a camera body can disengage from it s own (and fall down) when only the lens is carried. I had that happen with my D700, fortunately it was equipped with the MB-D10 so it had no damage otherwise it would have had.