Definitely a sturdy bed!  The beds themselves arent that heavy without the mattresses, but that staircase is very heavy!  Took quite a while to put it all together - I highly recommend getting a hex bit and socket to put it together, unless you want to twist an Allen wrench for days!  A couple pieces didnt fit together exactly as they were supposed to, particularly where the stairs join, so there are a couple small gaps or lips created. But my daughter and I can comfortably lay together on the top bunk and I still feel stable on the stairs.  The drawer lays on the ground and is so big its a little hard to manage by yourself, but my daughter learned to close it with her feet.  )