Southwest flyers - What carry-on do you use? (post pics!)

[jamstew]

The dimensions of the duffel are 18 X 10 x 10 1/2"h. I really didnt want to have to put anything in an overhead compartment. I was hoping the duffel would stick under my seat.

I don't think this would fit under the seat--there's not much room at all. I just carry a small nylon backpack and my purse.