Chicagos Lollapalooza Music Festival is launching a new cashless system, allowing attendees to buy food and drink with a personal RFID bracelet distributed on entrance. The system requires users to opt-in in advance, so no one will be forced to load their credit cards onto the bracelet, but organizers estimate even partial adoption could speed up often chaotic food and drink lines. Bonnaroo and Coachella both use RFID bracelets as ticket substitutes, but neither has taken the leap to a full RFID-enabled payment system.