I have two lightweight gray tarps (not sure what exactly they are called). One is just big enough to go under my tent. They are extremely light, cost maybe $8, and do their job well. The only problem I could see is because they are lightweight they could be punctured easily and tear from there if you don't take care of them. I've layed my on twigs, and normal camping wear and tear (tossing rocks on them to hold them down and such), and they are still doing well after a year of use.
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