Recently, I needed to carry a small suitcase with my bike. I always have a some bungee cords attached to my bike for when I do grocery shopping. So instead of walking with both suitcase and bike in each hand, I did the following:

You’ll need the suitcase’s wheels to be robust, so I would expect that this only work with quality brands; I went quite fast with mine without a problem. Another issue to be aware of is that the cords should be a bit loose in order for the rigid handle poles not to break; this also helps while turning.
Great idea !
How come that nobody thought of it before ?
Cheers,
RRX
Saar!
You´re a genius! How are you doing?
P
Not as smart as you, of course…
P
Is it Santa Claus?
Is it Nostradamus?
No… it is just Saar getting old!
Brazilian congratulations to you!
Paula