I have a Garmin Edge 705 and this is the only case that Garmin lists for it. You could easily fit four Edge 705's in it, maybe more. It's too short to hold the HRM strap without sharply bending the sensor part (probably not a good idea). I don't see how this case is a good idea. I can throw a number of other random things in there but this is really not what I was looking for in a case for my 705.