plastic bag; polyethylene bag
Common everyday term for a thin plastic bag, often used for shopping, garbage, or storage. ポリ袋 is more specific than ビニール袋, emphasizing polyethylene material.
I got a plastic bag at the supermarket.
生ゴミはポリ袋に入れて捨ててください。
Please put kitchen waste in a plastic bag before throwing it away.
Standard kanji-katakana hybrid spelling; ポリ is from ポリエチレン (polyethylene).
Kana spelling is common in casual writing or when the kanji 袋 is not needed.
Abbreviation of ポリエチレン袋 (polyethylene bag). ポリ is a common shortening of ポリエチレン in compounds.