What is this little pocket in my gym shorts used for? : r/whatisthisthing

What is this piece a plastic strapped inside a pocket in my shorts

BROKIG Men's Lightweight Gym Shorts,Mens Athletic Running Shorts

Wangdo Men's Workout Shorts 7 Running Shorts Athletic Bike Shorts

Pinkbomb Men's 2 in 1 Running Shorts Gym Workout Quick Dry Mens Shorts with Phone Pocket : : Clothing, Shoes & Accessories

Pinkbomb Men's 2 in 1 Workout Running Shorts with Phone Pocket

Bought a new shirt. This small packet was attached with the tags

Small Pocket Inside Shorts

PixelThat, Men's Gym Shorts, Men's Sweatshorts

Found connected to the inside of my pocket of a pair of swim

Pinkbomb Men's 2 in 1 Workout Running Shorts with Phone Pocket Quick Dry Athletic Gym Shorts for Men with Zippered Pocket Army Green at Men's Clothing store

Men's Pocket Shorts & Gym Shorts with Pockets – Gymshark

Ammonite Fossil Tie Tack, Golden Ratio Tie Pin. Geologist Gift, Paleontologist, Beach Wedding Men, for the Groom. Husband Gift, Dad Gift

Performance Underwear Compression Sports Tights - Base Layer

Small Pocket Inside Shorts

Pinkbomb Men's 2 in 1 Workout Running Shorts with Phone Pocket Quick Dry Athletic Gym Shorts for Men with Zippered Pocket Army Green at Men's Clothing store