Pokemon Bulbasaur 9-Pocket Portfolio - Rules of Play says:

Keep your collection organized and safe with this official Pokémon 9-pocket portfolio. Each portfolio holds 90 collectible cards single-loaded or 180 cards double-loaded. The portfolio features the iconic Charizard. Behind the vibrant, full-color cover are 10 high-clarity, archival-safe polypropylene pages with pockets sized to fit standard (2.5" x 3.5") size trading cards in Deck Protector sleeves.