I purchased two sets just because the price was so good. My wife said she doesn't want panniers on her bike but I figured having an extra set around was worth it for that price.

Just FYI, you have to install a magnet onto the rack which holds the bottom of the bag down. I was skeptical whether it would be strong enough to hold the bag down, but it does. The description of the bag isn't very clear but the pannier does come with the clamps necessary to install the bag on both the thule rack and any other rack. I made the mistake of purchasing the extra magnet clamp thinking it didn't come with the bag.