It’s inevitable, when kids get card games, they destroy the boxes. Or they get so frustrated trying the get the cards vacuum sealed back inside the box that you throw the stupid thing out. Either way, you need a backup.
Measure the length of the deck super scientifically by placing the deck on top of the sock. give yourself an extra 0.5 inch at the bottom and cut. Turn inside out and sew the raw edges together. Turn right side out and insert card deck.