I think you can buy an accessory strap for the city rollers. I don't know if its any good but might be what I will go for. I think I have something similar anyway lying around at home to avoid spending money. http://www.evanscycles.com/products/ortlieb/shoulder-strap-ec049799?utm_source=froogle&utm_medium=froogle&utm_campaign=froogle&utm_content=mkwid__pcrid_17321847296_kword__match__plid_
@zoombin1 started
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I think you can buy an accessory strap for the city rollers. I don't know if its any good but might be what I will go for. I think I have something similar anyway lying around at home to avoid spending money.
http://www.evanscycles.com/products/ortlieb/shoulder-strap-ec049799?utm_source=froogle&utm_medium=froogle&utm_campaign=froogle&utm_content=mkwid__pcrid_17321847296_kword__match__plid_