This easy on, easy off pannier is super cheap and works fairly well. I’ve been stuffing my man purse & grocery shopping stuff into it for a long while now and its holding up really well for the price. Folds in and out of the way easily with velcro, even comes with a rain cover that actually works. Reflective strips all around. No, you dont feel off balance riding with only one pannier. I hate to sound like a pimp but its on sale now for 9.99! I think today only at Nashbarf.
Good for holding camping stuff too:
Here it is on a rainy ride.