The several-year-old Novaras ($105) that I have are good commuter rear panniers, and the attached, stored cover will work, but they are not ideal for long rides in serious wet weather.
The pair of them have given me good daily service, I have to say. No problems with the fasteners, etc. And they'll each hold a 24-case of 12-oz cans.

Now that I have a pair of Ortleibs ($180) for the rear, I have used the (smaller) Novaras on the front. Works out well. But again, not for serious wet weather.