The McDonald’s French Fry Box Flap Has A Purpose? Did y’all know the flap on your fries box actually has a purpose? pic.twitter.com/abptKfFxSB — Today Years Old (@todayyearsoldig) January 5, 2019 So is the flap on the fry box made for ketchup?YesNoVote KetchupMcDonalds French Fries SHARE RELATED CONTENT The Big 94.5 Most Wanted Congratulations To The ACM Award Winners!! Bradley J’s After Show Tickets On Sale For Gary Allan At Prairie Band Casino Win Tickets To See Gary Allen At Prairie Band Casino & Resort! WHAT’S TRENDING: The Rock’s New Movie “Fighting With My Family” .