Reader Adlar from Stamford, CT submitted the following hack.
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As a person who solely relies on his bikes for transportation, one of
the issues I have had is transporting everyday luggage. I currently own a
bike trailer that does the job but I did not feel comfortable leaving
it locked at the train station with my bike. The challenge was to attach
my suitcase without a trailer and have it survive the 2 mile ride.
The first picture shows the difference between the D-lock and Kryptonite locks used.
It is important to note that with the D-locks used, there was too much play between the attached handle. This led to tire rub on both the handle and the suitcase. I suppose this could have been alleviated with smaller D-locks, but then I saw my Kryptonite disc locks and figured they might work just as well. Using the disc locks kept the suitcase at a safe distance on both my 700c single speed and 26 inch folder.