Intel defines the passenger economy as what will happen when self-driving vehicles and ridesharing services turn drivers into idle passengers. A captive audience with lots of downtime is a marketer’s dream, and one Techstars Mobility alum called Cargo Systems, which just exited stealth mode, has figured out a way to turn rideshare vehicles into mobile convenience stores.

The service, open to any rideshare driver who qualifies, allows passengers to use their phones to order simple sundries like a phone charger, pack of gum, or bottle of water. Drivers get a text alert after the order is placed that tells them which products have been purchased, which they then hand to the passenger. Passengers can pay via PayPal, Android Pay, Apple Pay, or by scanning their credit card.