LinQ Tunnel Bag
Finally, for those times we want to pack a little more gear with us, we decided to install the Ski-Doo LinQ Tunnel Bag (#850201273). Basically, all you install are two LinQ bases to the tunnel of your sled (each base in attached by two bolts through pre-drilled holes).
With the bases attached, you can throw on and off the Tunnel Bag in a matter of seconds. The installation of the bases takes about 15 minutes.