ROCKBROS Bike Rack Bag Saddle Pannier Bag Waterproof 6L or 9L

Good size, well made. Easy to tighten onto rearrack. Looks good. I have a folding bike with a rear rack. This bag is great for that, as its size and shape doesn't affect folding the bike. Big enough for bike tool, cable lock, and still have room for small errands or a packed lunch, or extra shirt, etc. It is also easy to remove the bag from the rear rack to carry with you if you are afraid of the bag being stolen if you have to leave the bike.