If you want to save as much weight as possible but still have a groundsheet/shelter footprint that’s more durable than polycryo or mylar, consider the Hyperlite Mountain Gear DCF Ground Cloth. We like the stakeout loops at the corners, which can be used on their own or attached to the corner stakes of your shelter with ultralight shock cord to keep the groundsheet in place. We also recommend the ZPacks DCF Flat Groundsheets, but the Hyperlite one featured here is larger and may be a better choice for those who have a lot of gear to spread out.