I've got a pretty cool messenger bag made out of a Gen Con 50 banner. But I will probably use my Bag of Holding.
Mine is the Duluth Trading Co., messenger bag. Its roomy and a lot of pockets and made of really durable combo of leather and firehose.,
Sadly it seems like its not carried anymore by the company
Chrome Kremlin (Ancient, big-honkin-bag), or Barrage, a smaller/medium Chrome bag, depending on the activities of the day.
Chrome Kremlin?!!! Are you trying to sneak a 10 year old child into the dealer hall?