Bunk beds have always been space savers, but with this collections optional Underbed storage and the 4 drawer chest built into the side of the stairs, you stretch your dollar even further! All drawers have European roller guides. Beds come Mattress ready with complete slat kits. Bunk beds accommodate 8' thick mattresses. Optional Trundle or Underbed storage unit can be purchased separately and used with the twin bunk bed or the stairway bunk beds. Stairway bed is reversible to go on either end. Weight capacity 250 lbs. Constructed of solid pine. Inside drawer dimensions are 15" D x 18" W x 4.75" H.