Liesl Made Weekender Bag - Free Sewing Tutorial and PDF Pattern
(try to make a pattern off of the pics) Pattern: Weekender Bag - Media - Sew Daily. Looks like it goes together just like the Amy Butler bag, minus the piping around the frame and no pockets on the edges.
Very detailed Amy Butler Weekender Bag Tutorial-- or a cute gym bag :)
Amy Butler weekender bag tips with links to other tutorials, including a internior zipper pocket