You are right! There is a single elastic strap there - I missed it and did not recognize it from the pictures in the manual. Thanks jimmy57.

Hi all - I recently bought a 2005 XC90 V8. The trunk floor lifts to reveal a thin storage compartment. Then under that is the battery, some tools, the space where the 3rd row seat bottoms slide into, and some empty space. That thin storage compartment has been bugging me - what is it for? A sheet of...