The photo above looks like the Engage, not the Micro. I find the Daypack to be a good size for me. Fits wallet, phone, camera, case for NavV, additional ear plugs, keys, and some other really small items. That's all I need in there. Don't have a good photo of it on the bike though.
I know you asked for the 'micro' bag, but I've just been away for 10 days in europe, and found the daypack bag superb.
I have it powered, and it holds.............. Sunglasses, camera, phone, wallet, passport, charging point/unit, ciggies. And this was in the un-expanded state.
Just went to the garage to take some shots that show the Daypack a little better (more light):
This shot is bad with the R in the background, making it hard to see, but I didn't want to open the garage, pull out the bike, find a suitable spot, then take photos from there. If you want a better side shot, let me know, I'll keep it in mind when I have the bike out anyways.
Note that this one isn't taken from eye level when on the bike, but from camera holding level when standing next to it and leaning over to align for the photo:
I find the size to be very good. It's completely out of the way, big enough to be useful, small enough to not be annoying. Before I get a smaller one, I'll get a slightly bigger one (City) so that I can fit a spare helmet visor in the tank bag.