Product sizes and amounts it claim to cook (5-7 kg) seems to have a discrepancy. How a 11x8x8 pot can cook 5 kg Biryani (5kg rice + 5 kg meat together) is beyond my understanding.
The largest size pot with 11" Mouth Diameter, 17" Bottom, 9" Height is good for around 7 kg biryani - that includes rice and meat together. It will not work for 7kg rice + 7 kg meat - that makes it 14 kgs.