It fit a lot; I even put my phone and keys in there, but when I'm out of saddle or when I rock my bike side to side, it will sway. I really dislike that, so I have purchase a Arundel Uno as a replacement. The swaying is only a cosmetic issue -- it does not get in the way of the function of the bag.
They provide warmth and are very soft on the inside. Though they are not cool enough for when the sun is out, they are perfect for all seasons but summer. When the extension is zipped-off, it gives a very iconic commuter/messenger look. Again, they are very soft and moderately warm, just enough for windy days. They are also a good alternative to the usual skin tight bottoms.
While I ride the shirt is so lightweight that I feel like like I am riding without a shirt on. The shirt keeps my core from freezing by the wind. It is very comfortable, but the end to the sleeves don't wrap around my arms.
They work for cool weather but sometimes my fingers still feel frozen in cold weather. I'd recommend choosing another that has more coverage. I am a little disappointed but I would still wear these for night rides in the summer.