Drinking on a Public Street
Be careful unless you are on the Las Vegas Strip.
The Las Vegas Strip
Generally, it is lawful to walk the Las Vegas Strip carrying alcohol in open containers of either aluminum, plastic, or paper. It is illegal to walk the Las Vegas Strip with a glass container regardless of whether it holds an alcoholic beverage or not.
Downtown Las Vegas (Fremont Street Experience, the Arts District and Fremont East District)
Generally, carrying alcohol in a plastic container in the Fremont Street Experience area is legal if the drink was bought from one of the casinos there. These large casinos carry “tavern licenses,” which permit its liquor to be taken off-premises. You might want to keep the receipt as proof to show the police in case you are asked.
Nearly everywhere near the Fremont East District and Downtown Arts District is off-limits for possessing an open container of packaged liquor.