Ski-Doo New OEM SR 21 Liter/5.5 Gallon LinQ Tunnel Bag, REV G4, 860201273 Semi-regid expandable LinQ tunnel bag. 21-liter (5.5 US gallons) capacity. Can be installed on top of Stackable LinQ Fuel Caddy - 15L (860201265) or behind seat. Easy one-second on/off tool-less system. Utilizes LinQ mounting system (Patent US 8777531 & US 8875830).