The City and County of Honolulu -- which covers the entirety of Oahu, Hawaii's most populated island -- is now enforcing a ban that prohibits stores from handing plastic bags to customers at checkout, making Oahu the last populated island in the state to give the bags the boot.
Hawaii is the first state to fully ban plastic bags at grocery stores. California recently passed a law that requires stores to charge for reusable bags, but the measure has been put on hold until a referendum is held in November.
In other words, whether or not you live in an area where plastic bags are already banned, it's a good idea to opt for a reusable bag. Store reusable grocery bags in the trunk of your car or opt for a lightweight option that can be folded down and attached to your keychain. Hanging a reusable bag by your front door can also help ensure you never leave home without it.