BCA MtnPro Tunnel Bag: How to Install on a Ski-Doo snowmobile.September 25, 2014BCA's Bruce Edgerly shows you what hardware you need and how to install a MtnPro tunnel bag on the tunnel of a Ski-Doo snowmobile. Home/Learn Avalanche Safety/BCA MtnPro Tunnel Bag: How to Install on a Ski-Doo snowmobile.Back to top