沙袋(英语:Sandbag,或floodbag),又称沙包,土嚢,以沙石或土壤装入袋子之中,用以防洪,或作为工程、军事防御之用。[1]袋子的材质,可以是麻布、棉布、或是塑胶材质。它的好处是价格便宜,制造快速,可以作为临时工程之用。
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