Adding to its portfolio of energy drinks, Amp Energy, a brand of PepsiCo Inc., introduced its newest flavor: Tropical Punch. Celebrating the brand’s partnership with Twitch, the social video platform for video game players, the new flavor launched in limited-edition co-branded Twitch cans featuring the Twitch purple color, the company says. Exclusively available at 7-Eleven stores nationwide, the new flavor contains 100 calories in each 16-ounce can and boasts B vitamins. The single-serve cans have a suggested retail price between $1.99 and $2.19.