Not to hi jack but I like your idea. I love my back pack but also hate the sweaty back. I think I will try your idea. Thanks
Not really my idea. I'm sure I stole it from another poster (who stole it from another poster, Who stole it from..., etc.etc.etc.). I simply had a milk crate lying around and actually attached it using some bungee cords I found lying in the street. Zip ties would also work.
I commute places where I don't like the idea of leaving a bag on my bike. Once I put the crate on I realized how versatile it could be and started grocery shopping with it.