2 metal fasteners for fixing it over the rack, 2 straps on each side to firm it better and stop them swaying.
The pannier bag retains sufficient heel clearance on any frame geometry, you won't hit your heel when you pedal.
Along with an elastic outer net pocket on each the same side. This is convenient when you want to take a bottle of water or an umbrella with you.
The bag has 2 spacious main compartments which are large enough for clothes, helmets, food, bike repair gears, and a host of other items.
Size: Large enough for your outing necessities.