Once the three flaps are locked into position, 1-2-3 bottom boxes takes its original shape and is ready to be filled in with the contents. The strength of this box comes from the fact that the bottom is reinforced with three flaps interlocked. This sort of design can handle the weight of the product, for which it is made, easily. Just like a jigsaw puzzle, easy to assemble however, these boxes are designed on the principles of robustness and strength. In comparison with the tuck bottom boxes, these offer you a higher level of strength. However, they are a little less strong than an auto-locked bottom box. In regards to the cost of production, these boxes are the cheapest among the two other option we have mentioned. The interlocking mechanism provides full support to the extended top flap.