I made larger sizes of the Tilly Shoulder Bag a while ago. I finally added those options to the shop this week!
You can find them in my shop here
The regular Tilly is 13" wide x 9.75" tall x 6" deep. It has this zippered pocket on the back (or front if you so desire). It has an open side pocket and a zippered side pocket.
The medium Tilly is 2" taller, all the same features.
The large Tilly also has the same features but is quite a bit larger at 16" wide x 12" tall x 6" deep. Great for traveling!