>>507817Or two tarps, one would be set above the other about 5 cm from each other. If the first one bends beyond the 5cm, the other tarp will set in and soften the impact and recoil.
I've got one of these tarps, 80 g/m2, LITERALLY as light as printing paper, easy to pack away, but I haven't tested it in rainfall yet. Only in winter as a moisture barrier from my sleeping bag, but it did the job well.