It is placed down the middle of the window , like the reinforcing tape strip on the other side. I tape the flat roll onto the bag with 3 lengths of 1" G Tape, overlappingt the top and bottom of the roll and place one length in the middle.
Thanks, acropolis. I think I can picture your set up now. Sounds like the whole package is pretty well taped up, except for that one "window" on the side opposite the tape roll. Neat idea.