The Postal Service kicked off the holiday shipping season by announcing that it will be delivering packages seven days a week in major cities and high volume areas starting Nov. 17 through Christmas Day in response to expected double-digit package volume growth.   "The Postal Service will be out making deliveries every single day during the holiday season, including Christmas Day," said Postmaster General Patrick Donahoe. "During the holidays, no carrier makes more deliveries to more places than the Postal Service, and this year, we`re raising the bar with enhanced tracking and Sunday delivery."   The demand for package service has grown as online retailers ship more products to their customers. The Postal Service is adding package delivery on Sundays during the holidays to prepare for the heavy shipping season.   "Every household in America relies on us to get their packages in time for the holidays, and we take great pride in taking on that responsibility," said Donahoe. "We`re prepared to do whatever it takes to deliver for our customers."   Every year you count down to the holidays and every year USPS trains hard to deliver them for you. Now in the final run-up, they are there with the tips, tools, and important dates you need to pull off a holiday victory. Order your free holiday boxes online today.   https://www.usps.com/holiday/