Three sleeping surfaces in the footprint of one bed. The upper bunk takes a twin mattress and is rated to 350 lbs, the lower takes a full and is rated to 400 lbs, and a twin trundle rolls out from underneath on wheels rated to 175 lbs, which turns an ordinary sleepover into something that does not involve an air mattress on the floor. The frame is solid pine with engineered wood and plywood, and it does not have to stay a bunk: it separates into two standalone platform beds when the children outgrow stacking or move apart, so the purchase carries forward rather than being replaced. Safety on the top bunk is handled with full-length guardrails standing 12 in above the mattress surface, and access is by a built-in three-step ladder rated to 200 lbs, integrated into the frame rather than hooked on. Wood slats run across every level, giving the even support that extends mattress life, and no box spring or additional foundation is needed on any of the three surfaces. Recommended mattress thickness is 6 in on the bunks and 4 to 5 in on the trundle, and none of the three mattresses is included. Assembled, the bed measures 78 in long by 60 in wide by 60 in tall with a trundle of 75.5 by 41 by 10.5 in, and it weighs 154.5 lbs in total. The plain, modern lines suit bedrooms, apartments, and guest rooms without imposing a theme. It ships in two boxes, which may arrive on different days.