The two boxes this came in was very heavy, which could attribute to the durability of this product.
A few hints, lay out all the boards 1 to 30 and the little baggies of screws and attachment pieces. Everything goes in order.
Also I used the drill on pieces A, E, G, K, M, O just be careful to go VERY slowly. I had to use the hand screwdriver on all the B parts.
I really like this product, I'm going to use it in my closet as the linen cabinet as the bathroom did not have enough space for a linen cabinet.