Ortlieb Back Roller Plus Pannier Set Black
Ortlieb is the benchmark standard for touring panniers. They are incredibly tough, fully waterproof, simple to attach and remove from your bicycle and quite large. This rear set would be a good stand-alone product for commuting or light touring, or they could be paired with a front set and handlebar bag for a full camping trek. The Roller Plus are constructed of very durable PVC coated fabric, which when combined with the roll top closure system, creates a fully waterproof pannier. The capacity of the main compartment is 40 Liters and each bag weighs approximately 850 g.
A link to a full comparison chart of Ortlieb products can be found here.