single ply bag

例句：

1. 1. This is a single-ply bag made of cotton.
   这是一件由棉制成的单层袋。
2. 2. Thesingle-ply bag is perfect forcarrying small items.
   这个单层袋非常适合携带小物品。
3. 3. I bought this single-ply bag at the market yesterday.
   我昨天在市场买了这个单层袋。