I have a pair for these bags and they are serviceable. I picked them up last year when they were on sale. They are narrower then most "rear" bags which is good for me with size 11.5/47 shoes. I have heel wacking problem with other bags. I only use one to carry my change of cloths and it has lasted a season.

It is just large enough to carry shoes and clothes in the main compartment. The top carries keys and a firstaid kit. The end compartment I carry an extra tube and small whatevers. If you need more space then you will need both bags or a larger model.