Awesome bag! Very easy to use, very spacious and great looking!
I really like how the straps are so soft. In the past I have used bags with stiffer straps and they tend to be rather uncomfortable. These straps are amazingly soft, as is the pack. When using it on the bike, it moulds to the shape of your back and stays where it is put.
The reflective material is eye catching (great for dark winter nights) and cool when used in an urban environment.
One suggestion for an addition: a key holder on a piece of cord? Would certainly be a useful addition.
Otherwise, a very fine pack with an awesome build quality, that will certainly last for a long time to come.