m4b: Suitable for BMW S1000XR (S1000 XR): liner bags for side cases

These bags fit the panniers well and are an economic alternative to the BMW option.They are made of relatively thin material, which means they have a high load to size relationship. I suspect they may have a shorter lifespan than the BMW part as the fabric feels less durable.I toured for 3000 miles with them this summer and they worked fine.