"Paper or plastic" will no longer be a choice at grocery store checkout lines in California under a new law signed Sunday by Gov. Gavin Newsom that bans all plastic shopping bags.

California is banning all plastic shopping bags at grocery store checkouts under legislation that Gov. Gavin Newsom signed on Sunday. Why it matters: The law that takes effect on Jan. 1, 2026, honors the intent of a ban on single-use bags "enacted 10 years ago that allowed stores to sell customers thicker plastic carryout bags that were considered reusable and met certain recyclability standards,