As strong as you'd expect the economy box to be. Easy to assemble. Flaw: top is way too hard to separate from the rest. Tears every time. Needs better perforation.
I was looking for an 8"x12'x10" box that I bought at the Union City Store but could not find it so I had to do with what you had available. I want to keep my year's records for taxes stored in the smaller box as they take up less room. I have used the larger boxes for many storage purposes as a teacher and found them easy to construct and sturdy. Lasted many years!