Ions ago, when I first started playing guitar, I was forever losing picks. I'd buy a half dozen at the music store and a week later friends would borrow them or they magically disappeared from my guitar case.
fall into the soundhole of your acoustic guitar.
Guitar Pick Punch is about the size of a 6" desk stapler, so it can easily fit into your gig bag or guitar case. It accepts a variety of materials as long as they are no more than 0.9mm thick. If you need a heavier pick, you can make two and glue them together.
It sells for approximately $25 USD