These boxes were bought to store old files in for my law office. I have used this type box in the past and am familiar with these. The only real complaint I have is some of the scoring for the bends in the boxes are not quite and heavy as they should be nor are the serrations. When breaking loose the box top and the sides the serrated edges are kind of hard to break free without tearing the paper. When bending the lids the scores are not heavy enough to make a clean bend in all cases. But as far as functionality and weight the boxes are great.