Philly-based Laplander makes these classic style panniers. While similar to Brooks' Brick Lane Roll-Up Panniers, Laplander's (more affordable version) are handmade in Philly from sturdy 14 oz. cotton duck canvas fabric with nice attention to details (check out the fabric on the black version for the inside posket!)... for sale at their Etsy store!
Stumbled upon them in Whole Living magazine (formally 'body+soul') who were included in the featured article... 'How to Ride a (Grown-Up) Bike: to Work, with Kids, and More'