The XLC Metro Tote Grocery Pannier mounts easily on most rear cargo racks for bicycles. It's sized to fit a standard re-usable grocery bag or a gallon of milk. It folds up flat so it's out of the way when not in use. There's also a zippered internal pocket for your keys or other valuables, and a removable padded shoulder strap, so you can take it with you to do your shopping!
Capacity: 1,144 cubic inches