Most stoners know that necessity is the mother of invention. Necessity is how the apple pipe, the gravity bong, and the butter knife dab were born. So it’s no surprise that cunning dabaholics and potheads have found ways to work through the labyrinthine complicated weed laws that haunt areas with legal cannabis.

Take for example the phenomenon of cannabis buses in Denver. The Colorado Clean Indoor Air Act makes it difficult for dispensaries and cannabis lounges to allow public consumption of marijuana (some have been raided for the offense). But that law does not apply to private vehicles.

That’s why some enterprising peeps in Denver have started up cannabis clubs on wheels. Hopper and Loopr both work in more or less the same way. Both operate a party bus that circles around Denver on a regular route (sometimes diverting for special events). Those who want to climb on board the bus download an app (Looper has its own while Hopper operates through HighThere!) that tracks where the bus is at any given time so you can meet it and get on. Both are BYO bud and wax.

The differences between the two are that Hopper is free and allows alcohol on the bus, while Loopr charges per day, week, or month, and is dry on the booze front, making Hopper sound like more fun but Loopr sound like the better business model, though Hopper says it plans to contract its buses to special events such as X Games.

The buses can be extremely useful to tourists who might not know anyone with a private residence who’ll let them burn one or want to risk getting busted for public consumption doing a dab in some alley.

But they’re good for locals too, working like bars for stoners, communal social environments where you can get a little bit wrecked.

“The cannabis consumer is not Spicoli from ‘Fast Times at Ridgemont High’ character anymore,” HighThere! co-founder Darren Roberts (who’s involved in Hopper) told Tech Insider. “We’ve taken the fun experiences people have had on our app — of connecting and creating friendships around the common interest of marijuana — and brought that to life.”

Photo via Flickr user Sids1