The U.S. Postal Service will offer Sunday hours in select locations for the holidays.

In Bowling Green, the postal facility at 5300 Scottsville Road will be open from 11 a.m. to 3 p.m. Sunday, Dec. 9 and Dec. 16.

“Holiday mailing season is the busiest time of the year,” said Susan Wright, the USPS corporate communications representative for Kentucky. “We wanted to try to offer some convenient hours on Sunday at select offices.”

USPS doesn’t expect delays or missed deliveries but wants to offer people more chances to ship their holiday packages. USPS will also increase its transportation staff and extend delivery windows, including Sundays in locations with high package volumes.

“We are all hands on deck,” Wright said. “We are going to be delivering packages seven days a week.”

Nationally, USPS expects to deliver 900 million packages between Thanksgiving and New Year’s, which is up from the expected 600 million package deliveries during the 2015 holiday season. That doesn’t include envelopes or flat-sized mail, which would bring up the total to nearly 16 billion deliveries this year.

“Things have changed, everyone shops online,” Wright said. “It’s a different mail mix.”

That’s partially thanks to Amazon. USPS is estimated to handle about 40 percent of the e-retailer’s brown boxes, according to The Associated Press.

Due to this changing culture, there is no longer a single busiest day for holiday shipping. USPS simply says the two weeks leading up to Christmas are the busiest time. But USPS predicts Dec. 17-23 will be the busiest mailing, shipping and delivery week.

Wright recommends that people expecting to ship or receive a lot of packages this year sign up for USPS “Informed Delivery,” which monitors delivery schedules, sends you updates and allows for customizable delivery options online.

For any individuals unfamiliar with how to personally ship a package, USPS offers tutorials on its YouTube account, “USPS TV,” and Instagram page, @uspostalservice.

This might be more common among the younger generations, or perhaps people who don’t normally ship or mail items during other times of the year, according to Wright.

“These instructional videos are perfect for that,” she said.

The deadline to send packages via regular ground shipping is Dec. 14, and the deadline for first-class or priority mail shipping is Dec. 20.