Package delivery will be limited.
President Donald J. Trump has declared December 5, 2018, as a national day of mourning, calling on Americans to remember former President George H.W. Bush who passed away on November 30, 2018.
Days of mourning are recognition given to mainly commanders in chief, and involve memorial activities and flying of flags at half-staff.
Nonessential federal offices will be closed on December 5, 2018.
Every United States Postal Service store will also be closed. They will not deliver regular mail, but they will deliver a "limited" amount of packages. It's not clear what their definition of "limited" is.