Ortlieb Waterproof Rear 1525+ c.i. Bicycle Panniers
About Ortlieb - "ORTLIEB products are characterized by tightly sealed closure systems such as roll closures, waterproof zippers, Velcro closure or sliding seal closures. "
Waterproof bike bags are fully waterproof with sealed zippers and materials that repel water even when soaked.
These bags are usually larger and are designed to fit on rear racks.
Capacity is the total capacity, measured in cubic inches. If two bags are included, this is the rating for both bags combined.