Needing somewhere to carry my airman pump to go with the puncture repair kit and not wanting to have the boxes on all the time. I have the vario panniers and have looked at various ways of fixing a box somewhere. The tool tubes aren't big enough in diameter. Came across the thread about recessing the pillion seat. Got a seat and away I went. The silver thing in the middle is a strap that keeps it in place when you remove the seat.
so unfortunately no good.