How much luggage can a person have when using Qatar Airways?

If you look at Qatars website it should take you about 2 minutes to find what you need, that's what it took me. On all flights except transatlantic you are allowed 20kg MAXIMUM of checked baggage(this is the weight concept) in any amount of suitcases. This is not good as most suitcases will weigh 4 to 5 kg. Again it is not 20kg per case but 20 kg total for ALL of one pengers cases. For transatlantic flights you are allowed 2 suitcases per person at 23kg per suitcase. Obviously this is much better. Each penger is allowed 1 carryon weighing 7 kg.(this is almost laughable).