If you're planning a tour on your bike and need panniers to have room for all your essentials, the Side Duffel is the bag of choice.  With reflective tape, expandable roll-up closure and generous space for your goods, the Side Duffel has the features and expandability you're looking for.  Made from durable fabrics and sewn with Jack's own commercial Juki sewing machine, you can bet it will take a beating.  Allow 3-4 weeks for delivery as each bag is made from scratch and can incorporate personal design requests straight from you.