SKINZ TUNNEL PACK for REV GEN4 850 ETEC is built tough with durable urethane coated material, water resistant zippers, and nylon straps with quick disconnect buckles for removal. This mounts right in existing LINQ bracket holes and is a 5 minute install. The bag weighs less than a pound compared to about 6 pounds empty on the smaller LINQ bag from Ski-doo with the wicked heavy plastic base plate. These look great and function really well in the field. The snap buckles allow you to detach the bag in seconds. I've been running one for 2 years on three sleds and wouldn't go anywhere without it.