bought this product to hold our patio furniture cushions. We have large cushions and were able to get all but one into it. The measurements were good. went together fairly easily but did have to go out and buy a wrench for some of the bolts. I read one previous review and they said to use silicone caulk around the edges and where bolts went (on top) I did do this and it is a very good idea.  We have had two really bad rain storms and the cushions were bone dry. (hooray). Really a good product. I do not need to lock it but I do because i feel it gives a better seal. 
So far very happy I purchased this after weeks of reading reviews and searching for the correct size.