* 20 Pack - Card Storage Boxes * Holds up to 675 cards: Each box holds & protects approximately 675 standard size trading cards with no sleeve (total 13,500 cards) or 565 cards with Invested Alliance Penny Sleeves (total 11,300 cards). * High quality white corrugated paper: It’s not only thick and sturdy to securely store sports card collections, it’s also easy to label and/or decorate. * For standard size collectors cards: Our storage boxes measure 12.25” x 3.75” x 2.75” on the inside and 13” x 4” x 3” on the outside. They protect standard 2.5” x 3.5” trading, gaming and sports cards but do not fit 3” x 4” toploaders. * Easy assembly: One piece box folds in seconds without tape, glue or staples.