Originally Posted by sinoflyer

IIRC, the aisle seat has the smaller "third gap" in front of it. My laptop bag won't fit in it, and I never think twice about putting it in the center gap. Conversely, when I'm seated at the window, I have no problems with my seatmate putting their stuff in that spot. That center gap, although it's off-center, is really neutral ground. Anyone can use it, but I think deference should be given to the person on the aisle.