The easiest way to anchor your tent using the sandbag weights is by filling 2l plastic PET bottles with either water or fine sand and inserting these into the bags. The bottles ensure there is no leakage of the filling, you easily and quickly insert them in the bags, and it helps keep the actual polyester bags clean. Each bag offers either 4kg of weight (when filling PET bottles with water) or about 6kg of weight (when filling PET bottles with fine sand)