The bag is about 10" x 12". it is very soft and flexible and has a lot of pockets. I have room for all of my eyeglasses and sunglasses and electronics, and there will be room for my Blackberry Playbook if it is EVER released! The strap has enough friction so the bag does not try to slide off my shoulder. Overall i am very pleased. Note that the bag is BLACK, not gray as implied in the photo.