Matthew McConaughey—the lieutenant of L-I-V-I-N, the commander of casual, the bombardier of being real—was at Sunday's Astros-Red Sox game, wearing a fanny pack. He did not care about anyone else's opinion of his fanny pack.
CSN Houston's Julia Morales, a self-admitted fanny pack enthusiast, talked to McConaughey during the game about his f-pack (that's short-term for fanny pack). He uses it to keep all his important items on him without filling up his pockets. Smart man.
McConaughey had one tip: wear it to the side so it looks cool and chill. You can't look like you care about wearing a fanny pack.
Also, when wearing a fanny pack, it helps to look like Matthew McConaughey.