To say Fortune's Most Powerful Women have a lot of responsibility is a major understatement: the CEOs on our 2017 list control a total market cap of some $1.1 trillion.

It should come as no surprise, then, that when asked the women on the ranking about the one item they always have on them, a number of the executives cited their phones. In fact, cell phone were the most popular item, with eight women saying it is a must-have at all times.

"I'm never without my phone," says IBM CEO Ginni Rometty . "It's important to be in constant contact with your clients and the marketplace."

Phones aren't just for keeping up with business, however, PG&E CEO Geisha Williams points out: "It's a lifeline to my work and to my family."

Click here to subscribe to the Broadsheet, Fortune’s daily newsletter on the world’s most powerful women.

Some Fortune MPWs are practical, carrying around items that help get many women get through the workday. These include hairbands ( Microsoft CFO Amy Hood ), dental floss ( NBCUniversal chairman Bonnie Hammer ), and an extra pair of shoes ( Reynolds American CEO Debra Crew always has "a great pair of high heels," while J.P. Morgan Asset & Wealth Management CEO Mary Callahan Erdoes always has her running sneakers).

Others are more sentimental: Bank of America vice chairman Anne Finucane keeps her mother's pin with her at all times, Synchrony Financial CEO Margaret Keane carries around her father's badge, and Johnson & Johnson company group chairman Jennifer Taubert keeps a small stuffed animal with a big backstory: