Give a description of how the dwarves survived the escape and the trip in the barrels.Why is this so important that Bilbo not be in a barrel?

Bilbo had to pack everyone else into their barrels, but he had no one to pack him.

"Of course he was not in a barrel himself, nor was there anyone to pack him in, even if there had been a chance!"

The dwarves bobbed and bumped into each other in the water,