The deepest breaths I take are not in barre class or during a cliffhanger episode of This Is Us. No, it’s when I place my checked bag on the scale at TSA, waiting to see if my suitcase is over or under 50 pounds. I always come close. I mean, don’t you also pack eight pairs of shoes, five books, two laptops, a sun hat, multiple pairs of sweatpants, and ankle weights for a three-day beach vacation? Well, leave it to TikTok to come up with a genius way to stash all of your excess belongings without the fear of a last-minute overweight suitcase. The secret? A pillowcase.