BMW R1100S Tankbag Online Instructions
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 Front two straps attach, one on the left and one on the right, to the fairing support members that run along the inside of the bodywork. This whole job takes less time than reading these instructions!
The
image is marked with an arrow.

NO YOU DO NOT NEED TO TAKE ANY BODYWORK OFF!

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 Picture at left above, and the photo directly to the left, were taken with the camera setting on the front fender. The arrow is pointing to the very spot you attach the webbing on the left side of the motorcycle (Left being as you are setting on the motorcycle.) These points are what I refer to as fairing support brackets.
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 The third strap attaches under the seat ... carefully wrapping it around the bracket that holds the little electrical box shown. This is very simple to do .... Just be careful not to pinch or put pressure on any wires.