This Ortlieb messenger bag is perfect for bike commutes! It has a roll top closure to ensure the elements stay out, a padded messenger strap for one shoulder wear, organization and protection inside for your laptop and accessories, and reflective accents for safety. It’s meant to be used with a rear rack. You can see the hooks and adjustment for rack position in the photos. You don’t need an Ortlieb rack but just one that is compatible. I do have two dogs and do my best to get rid of any dog hair but I can’t guarantee none! Here is the Ortlieb description. This is a $210 bag in great condition so please make only reasonable offers. https://www.ortlieb.com/usa_en/office-bag-urban-ql21+F70713