MTG Kaladesh Booster Box
Magic The Gathering: Kaladesh Booster Box - Rules of Play says:
THIS PRODUCT WILL SHIP SEPTEMBER 30th
Each booster box contains 36 booster packs, each with 15 random cards from the new Kaladesh set. Grabbing a booster box is a brilliant way to get into the new set by getting your hands on a ton of new cards for a great price!