S
Sandi Practical size, with one large compartment, a rain cover and smaller pockets within the large compartment, so would be a great commuting bag. Can easily fit a laptop in. I also really like the large reflective front for that extra bit of safety in the dark.
However, was too long for my small frame (4'10"!) and so the waist straps did not sit in the right place and sadly had to return.