EcoBox 39 x 8 x 75 Inches Shipping/Moving Carton for Twin Size Mattress/Box Spring (E-591) mattress/box spring not included This cardboard box fits most twin size mattresses Inside box dimension is 39" x 8 x 75 Purchase is for one box only If desired, a second box must be purchased for the box spring 100% Recyclable MATTRESS/BOX SPRING NOT INCLUDED^This cardboard box fits most twin size mattresses.^Inside box dimension is 39" x 8 x 75.^Purchase is for one box only. If desired, a second box must be purchased for the box spring.^100% Recyclable.