I was surprised to see that this mailbox was plastic. On a scale of 1-5 (5 being Very Sturdy) I’d give it a 3. It did not come with the 4 screws you need to attach it. I imagine that once you attach it, it will sturdy up more. The lid is a bit on the flimsy side. It bends (or twists) a bit when you open & close it. It’s very plain. Very minimalistic. Overall, it should get the job done & keep your mail dry. It wouldn’t be my personal choice, but will definitely work. 
Also, when it closes, there is a bit of resistance, as if it is getting hung up on something. But like I said, it will definitely work to hold your mail.