Great for grade-schoolers. Holds 10-inch thick twin mattresses on top and bottom bunk. Trundle holds 8-inch Gel Memory Foam Hybrid Mattress, Twin. Full setup by Wayfair and it took a few days between delivery and setup to schedule, but they said they were still working the kinks out as a company with bunk bed builds. They set it up in 2-3 hours and cleaned up all the boxes. If you want the setup team to take your boxes away; I would recommending telling them when they schedule your apt.