The moving boxes are sufficient for a move. More than one will not survive the most. They are easy to assemble, hold a lot of weight. We are not a single carton broken but travel the cartons at the question a slightly openings. This means that if the cardboard is very hard, it's easy to become cracks in the bracket.
For a move I can recommend it, even after moving they are practical to merge again or usable in storage boxes. For the next move but I would invest in new boxes.