The continuing explosion of online shopping could double small-parcel shipments in the next five years. Already straining to satisfy demand, FedEx is making a move to expand its distribution capacity.

Beginning in January 2020, the Carrier will be adding year-round Sunday delivery service in order to begin delivering seven days a week. This shift comes in relatively short order after a change last September that expanded the service to six days a week.

Today’s shoppers “want packages over the weekend,” said FedEx President and Chief Operating Officer Raj Subramaniam. “As soon as we went to six-day, we started hearing about seven-day.”

At the same time, FedEx is consolidating its network by moving away from its longstanding SmartPost arrangement with the USPS, where the postal service picked up final-mile duties for FedEx residential deliveries. Beginning autumn 2019, FedEx will be taking back the vast majority of these deliveries in order to keep more of the sorting and delivery process in-house.