Huge.  Fit my cargo carrier perfectly.
This thing is huge.  I actually purchased two of these, thinking one would not be enough, and I would stack the other on top of it.  Not only was I able to fit everything needed for a trip inside this thing for a 9 day trip for 6 people, I got extra toys for my five hear old, and my van was empty except for people and a cooler.  On our return trip, we hit heavy rain, and freezing temperatures.  Everything stayed dry and clean.
Rating: 5 stars