Ortleib panniers ( https://www.google.com/search?q=ortlieb+panniers ): * Are actually waterproof * Don't have lots of unnecessary compartments and pockets * Lift on and off really securely, yet really easily * Can be wiped clean * Super durable * Light * Can be worn as shoulder bag, or carried as a tote * No zips, yet can be completely sealed
With my Ortlieb bag, I regularily get stuck with one of the hooks in the back pockets of my trousers, so I have a habit of always removing the hooks altogether if I'm not using my bike, which is a bit of an annoyance. The Ortlieb bag is much more durable however.