Haw. Rev. Stat. § 291-3.2: Consuming or possessing intoxicating liquor while a passenger in a motor vehicle.

(a) No person shall consume any intoxicating liquor while a passenger in any motor vehicle or on any moped upon any public street, road, or highway.

(b) No person shall possess, while a passenger in a motor vehicle or on a moped upon any public street, road, or highway, any bottle, can, or other receptacle containing any intoxicating liquor which has been opened, or a seal broken, or the contents of which have been partially removed.

(c) Any person violating this section shall be guilty of a petty misdemeanor.