The neon green fanny pack strapped around Annabel Hess' skinny jeans carried all the essentials for a music festival: credit card, driver's license, phone, Chapstick.

And her passport.

The 25-year-old concert-goer wasn't headed out of the country after Miranda Lambert closed the first night of the annual Country LakeShake festival. She brought it to sign up for TSA PreCheck, the government's expedited airport security program.

Hess, a regular traveler, had been meaning to sign up so she no longer has to beg other passengers to cut the security line when she's running late for her flight. Her roommate has had PreCheck since college and saw the festival's pitch about enrolling on-site and getting a fast pass through festival security as a bonus. 

"This was an easy opportunity,'' Hess said. "So here I am.''