Looking For A Yoga Bag

I think that if I had a practical yoga bag, then I would go to more classes. The bag that I currently have is quite difficult to carry on public transportation. It takes up too much room. I would like to have a bag that I can carry on my back. I have to carry this bag on my shoulder or carry in my hands.

The problem that I am having is finding a bag that can hold my clothes and a yoga towel. This was once the perfect yoga bag.