I was wondering if the absolute strap is interchangeable between bags. I already have one for my Aeronaut, and I have one ordered along with my cafe bag. Some day (soon!) I will also want an Imago. When I order that Imago, will the Absolute straps I already have go on it? In the picture, it looks like the simple strap is attached (not removable). I really can't justify more than 2 absolute straps!