Perfect size for camera, wallet, gloves and a few snacks. The map cover works really well and attachment to handlebar is solid. Only minor complaint is carrying strap falls off.
The problem with this bag, is
1 not easy to install. I had to have the bicycle shop do it.
2 sits up too high so that it's impossible to mount a headlight on the handlebars
It does hold a lot of stuff. I did a five day self supported ride with this bag, and did not need front panniers.