Shortages of packaging supplies like paper to-go bags are causing headaches for fast-food restaurants. McDonald’s Corp. recently told its restaurant owner to limit orders of bags from suppliers, reports Heather Haddon for the Wall Street Journal. Orders for the bags are running ahead of last year’s high numbers. Many customers are asking for their Big Macs, McNuggets and fries in bags even when they dine inside, driving the tightness, the chain said in its message to owners. Contributing to the strain are workers who have spent months packing orders in bags converting to serving meals on trays, the company wrote in its message. Haddon reports that McDonald’s wrote in its email that “Many new crew members have never had to deal with trays before. [The] transition to using trays has been slower, more difficult because we haven’t done it in so long.”