That depends on my trip, my short hike setup would be a silnylon tarp, a couple oversized plastic bags and "TYVEK" ground sheet. Would this be suitable for cold winter "NO" I would have to find some insulation layer between me and the ground like leaves etc. If I am unsure of leaves in the area, I have a self-inflating pad full length that packs down pretty small.

On longer trips, I bring a larger tarp and fashion it into a "Wedge" shape structure or a backpackers tent.