Are you ready for five-days-a-week postal service?

Customers are continuing to migrate to the Internet and to cheaper standard-mail options, and away from the Postal Service’s signature product — first-class mail, Postmaster General John E. Potter will report in announcing the projections.

The Postal Service experienced a 13 percent drop in mail volume last fiscal year, more than double any previous decline, and lost $3.8 billion. The projections anticipate steeper drops in mail volume and revenue over the next 10 years, and mounting labor costs only complicate the agency’s path to firm fiscal footing.

In an effort to offset some of the losses, Potter seeks more flexibility in the coming year to set delivery schedules, prices and labor costs. The changes could mean an end to Saturday deliveries, longer delivery times for letters and packages, higher postage-stamp prices that exceed the rate of inflation, and the potential for future layoffs.