You know how devices are getting smaller and smarter and you know how much we love carrying around the good old grasby pumps, I have spent a small fortune on bags that are just the right shape and size to carry the pump, from expensive leather to very cheap clearence bags and have amassed quite a few (40 odd). i mean if you are going to have to have a pump then you might as well make it look cool. I heard the RBH were changing their pumps I had visions of smaller, neater, better what I got was the Mckinley pump granted it has extra bells and whistles is more accurate and does not have that damned plastic black thing that held the syringe in place and snapped for a past time. But it is huge almost house brick sized and the batteries last all of 3 days (don't bother with the cheap ones they barely do a day) I am sure I will grow to love this new addition in my life and I perfectly understand why this pump was choosen looking at the research I would have made the same call. On the plus side I now need new bags and tell me what girl does not like going shopping for bags Oh yes the reason for this post, has anyone actually worked out how the pump bag supplied is supposed to work, cos no-one I have met so far has!