Store an extra mattress below your Fun Bed for sleepovers or use for a storage box.Fun Bed sold separately Features: -Assembled 74.4" x 39.4" x 7.5" -Assembled weight 70.5lbs -Trundle inner space dimensions: 72.4" x 38" x 4.7" -Please note: available storage height is shorter than standard mattress height due to box and bed height restrictions. Trundle space also makes for a great general storage solution.Product Dimensions (in): 39,37 x 74,4 x 7,48Product Weight (lb) :70,54Box Weight (lb) :79,36Box Dimensions (lb): 81,88 x 22,83 x 4,72