I use REI panniers for commuting. Not these exactly, but an older model. Luckily, they were a birthday gift from a very generous friend.
Best present ever.
The compact size of these panniers make them a great choice for your 'round-town errands, short tours, or as front panniers on extended trips.
Basic top-loading design has a large opening for easy access to gear
Zippered top pocket provides extra storage and helps secure the load with its tension compression system
Made of ballistic nylon with a polyurethane coating for durability and splash protection; day-glow lining makes contents easier to see
Reflective piping increases your visibility at night
Each of my panniers has 2 zipper compartments and a front mesh zipper pouch. I can fit my lunch, extra shoes, extra layers, personal items, bike lock, pump, and patch kit. Plus I can bungee cord something else to the top of the rack if I need to.