I purchased the brown version of this bag for my scooter. I could see using it on any motorcycle rack though. It's very stylish, and I use it daily on my commute. It's pretty big inside, will hold a full face helmet. I use the side pockets for sunglasses and my parking lot pass. I have about 800 city miles on it so far and it's holding up well. I do use a bike cover during the day so it is out of the sun. Overall a great bag and I really like it.