plastic shopping bag; carrier bag
Refers to the thin plastic bags provided at store checkouts. Often used in contexts of environmental reduction or charging fees.
レジ袋は有料になりました。
Plastic shopping bags are now charged for.
レジ袋を辞退してエコバッグを使う。
I decline a plastic bag and use my reusable bag.
I got a plastic bag at the supermarket.
I had my own reusable bag, so I declined the plastic bag.
Since last year, plastic shopping bags have come with a fee.
I bring my own bag because I don't want to pay for a plastic one.