the preparation of the person who are upstair, I think it is risky. We have four people going together in Shanghai and our suitcase for delivering is 23KG while on the ticket, it is 20kg. That's the problem of the agency whom we found for she said that we can bring 40kg with us. It was terrible that we dropped many of our stuff to our parents in the airport. So I think that the suitcase of delivering should follow the limitation on the ticket or depends on the RP; joke.
Then to the suitcase of bringing personally, I bought a case with the wrong size; depressed, it is said to be 20 size; however maybe with the 22 size. So when I entered, the staff blocked me and checked its weight. It was too heavy however, for my brother was seeing me off and he is Shanghai Ren and pleaded... I have only this suitcase with me.
And the girl with us flying has a bag bringing computer and a suitcase of the right size. It is said that suitcases bringing personally ask no limitation of the number, however with the weight. So if reasonably, staff would not check the weight, except for my situation of buying a bigger suitcase. faint...
Wish this would help.
Good luck with your suitcases and your trip!