One of the worst purchases I have ever made. To start with the panniers don't come with any instructions. However, once fitted, they repeatedly slipped off banging into my spokes or sliding off completely - not good when this happened at a busy junction almost causing me to fall off my bike and into the traffic. Eventually I had to start using a bungee rope to get the panniers to stay on. The final straw is that now, after less than 6 weeks of use, a huge rip has opened up underneath he zip of he top compartment.