This Extra Large Kit comes with 10 X-Large moving Boxes. Our boxes are run through strength testing to ensure the durability of shipment, storage, and holding items for a safe transition from place to place. These boxes are single walled professional grade 200#/ECT-32 quality. Having a high quality box is an essential factor in the preservation of the items you want to move. They are sturdy and cheap, so you can be assured that your items will stay safe, even when you are on a budget.