Copper Spur UL2 Bikepack FootprintDescription The Big Agnes Copper Spur UL2 Bikepack Footprint is a protective ground cover made for the Copper Spur UL2 Bikepack tent. It helps protect the bottom of the tent and adds an extra waterproof layer between the tent floor and the ground. Big Agnes also states that it enables a lightweight Fast Fly setup when used with the tent fly, poles, and stakes. It is compatible with the Copper Spur UL2 Bikepack, the Copper Spur UL2, and the Copper Spur