McDonald's is introducing new packaging in its continued effort to improve its business and target younger consumers.

CHICAGO — First McDonald’s worked on its food. Next up for its nearly yearlong face-lift is a revamp of its boxes, bags and cups.

The world’s largest burger chain will roll out to its 15,000 U.S. restaurants this month new bags, cups and sandwich containers featuring a graphic design it hopes will attract millennials, the fastest-growing segment of the U.S. population. It’s aimed at a generation that appreciates design, but also demands simplicity because of the constant distractions of smartphones and other technology.

The new packaging is part of an effort to get a consistent brand experience in stores, drive-thrus, kiosks and on McDonald’s mobile app, said Matt Biespiel, McDonald’s senior director of global brand development. McDonald’s, based in Chicago, launched its mobile app and started rolling out “Create Your Taste” custom burger kiosks in restaurants last year.

It’s the first major packaging redesign since 2013.

The designs are simple yet bold — a combination that McDonald’s says reflects the leadership of CEO Steve Easterbrook, who has been in the top job for nine months.

Under his watch, the company has reported its first U.S. same-store sales improvement in two years, launched all-day breakfast, introduced a new “McPick2” value menu and stripped poor-performing items off its menus.

It has simplified operations to get food ready faster and made tweaks to improve quality, like toasting buns longer, changing how burgers are seared and switching to butter from margarine on Egg McMuffins.

The new packaging took about a year to develop, a far faster process than in previous incarnations, Biespiel said. It’s also a nod to the renewed sense of urgency at the company since Easterbrook took over.

Biespiel said the redesigned packaging is meant to pay homage to McDonald’s signs, the most recognizable brand image that’s seen around the globe. The font is modern and clean to attract not only the eyes of millennials but also a growing number of customers glued to their phones or other technology.

“The world is coming at people at a faster and faster pace,” he said. The packaging “has to be simple, it has to be iconic and it has to be true to what the brand is.”