This is definitely not sturdy, I've tried boxes. Even a trash can and you struggle to get the wheels to walk up the stairs. For the price, I would have been better off getting a hand truck. The concept is great but it's just too hard for me to use it. It I'll likely be put aside but I'm still trying for different things. Note: although a woman, I'm by no means weak. I regularly lift 40 pounds plus. But the idea is to make it easier on me. It just didn't meet MY expectations