Pack is well stiched and zippers work great. Buckles are good quality. Buckled on without problems to the tunnel loops of my 07 Arctic Cat 1000 Crossfire SnoPro. Stuff inside stayed dry even in powdery conditions. Pack could be a bit larger but for a removable day pack it still has ample room.
The Skins Tunnel Bag is perfect for the tunnel of My F8, It removes and installs in seconds and is completely waterproof unlike the stock seatbag. It is the perfect size for a short backpack trip and the convienence of the quick release clips are great. If you have the tunnel rails installed you dont have to drill and rivit on the tabs you can simply use the tunnel rails to clip the mounting tabs to.