I believe that the navigator is smaller than the XXL. I have the XXL and let me tell you, it is big and heavy when full. When I used to go to crops a lot, I'd take it and would have to get someone to help me get it in and out of the car. I could put my baby bug in the bottom and then get everything I needed into it. I've had it for about 12 years and it's been very durable.