It measures across the bottom 11 inches..As you can see it gets wider from there by about 1 inch on each side. From the center of the bag to the bottom it measures 10 inches.

Two pockets on the front and one large pocket on the back

Inside - 1 long zippered pocket. 2 pen pockets, 2 other pockets inside 2 different sizes.

Extended all the way the strap drop is 24 inches.