BMW R850R & R1100R
Tankbag Online Instructions
  
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 Front two straps attach, one on the left and one on the right, to the oil cooler bracket tubes.

Left attachment point shown at left
  
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Right attachment point shown at left

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 The third strap attaches to the seat adjuster bar, as shown at left.
  
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the cross over strap helps keep the webbing from falling away to far when removing the bag, on motorcycles with no or little fairing or bodywork.

If you choice to use it just string it through the attchment webbings as shown.