protective ground cover for Copper Spur UL2 tent Protect the bottom of your tent and add add an extra waterproof layer with a tent footprint! The Big Agnes footprint also enables you to pitch a lightweight, Fast Fly shelter while leaving the tent body behind. The Fast Fly configuration requires the footprint, tent fly, poles, and stakes. Compatible with the Copper Spur UL2, and the Copper Spur UL2 Bikepack.