What do you call that plastic that you seal gift baskets with?

What do you call that plastic that you seal gift baskets with and how do you seal your basket? Do you need a machine for that?

What are other ways to seal your gift baskets so the gifts inside it won't fall off?

Thanks! ^_^
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Cellophane Rolls are typical. You can also use mesh or netting or any sheer material although it doesn't shrink to fit. If the basket is small you can even use a colored stocking,
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