The boxes are in fact very stable. During the move, only 2 of 25 ripped the handles, to have to say that this sensitive zone, by folding the side flaps, nor could have been strengthened, which I did not. Ergo: You have kept super. The biggest advantage I see, however, that one, the cartons are delivered to your door and (like mine) are bundled by the postman worn in the 2nd floor. One does not have to the hardware store, do not squeeze the cardboard into small to car and home run 3 times, because you will notice not all at once. Especially the cheap cartons can not match even remotely with the quality of the carton from the hardware store plus they cost twice as much. Conclusion: Cheap, convenient, stable!