These do seem thinner than the older version 03325. Two main problems: 1) the perforations are not complete enough causing the boxes to bend when separating them and 2) they tend to crush when stacked more than four high. A plus: they are fairly easy to assemble just do it slowly!
I am putting stuff into a storage rental and these boxes worked out well. Easy to assemble held the books and papers that I was storing and stacked easily.
We purchased this brand for the first time and they worked out very well. They are of good quality and can hold an entire box of heavy files. I recommend this item.