Longman Dictionary of Contemporary English
Wiktionary
n. A strong bag with handles used to put purchases in; usually made of plastic, paper or fabric, often given away with a purchase.
WordNet
n. a paper bag made of strong paper (often with handles); carries goods while shopping
Wikipedia
Shopping bags are medium-sized bags, typically around 10–20 litres (2.5–5 gallons) in volume (though much larger versions exist, especially for non-grocery shopping), that are often used by grocery shoppers to carry home their purchases. They can be single-use (disposable), used for other purposes (storage, can liners, etc.) or designed as reusable shopping bags.
Usage examples of "shopping bag".
The shopping bag still lay where she had dropped it in the living room.
Oh, which reminds me, do you know what's become of my shopping bag?
On reflection, Mustafa decided to put the guns there, too, and so all four of them, each carrying his shopping bag, walked out to the car and set the bags standing up on the floor of the trunk.
There was no suitcase large enough to hold his armor, so it was put into the biggest shopping bag.
She was digging deep in the shopping bag on the floor there between them after all, being run over by a car?
It was a shopping bag from Bloomingdale's - lying on its side, vomiting rags and a doll's head and a copy of Vogue, a RAMJAC publication.
Standing in front of the dumpster, shifting from one foot to the other, was a small white woman with a full shopping bag in each hand.
Finally the android stuffed the take-out bag into her shopping bag and returned to where Cyndi waited.
He carefully set the shopping bag on the asphalt and moved forward a few more feet.
I ran over to the couch, where my clothes were neatly folded on the floor and began to stuff them into the shopping bag, which promptly ripped.
He told her all of it-how, he had first taken him for a shopping bag woman, because of the hair, and then realized it was a man-a man who looked enough like him to be his twin.
Kovacs called in Magyar, then jumped down from the cab with the paper shopping bag.