The REI Kingdom 6 is a tunnel-style tent with a maximum capacity of six people. It has a total floor area of 83.3 square feet and a peak height of 75 inches. The REI Grand Hut 6, on the other hand, is a cabin-style tent with a maximum capacity of six people. It has a total floor area of 100.6 square feet and a peak height of 84 inches. The Grand Hut 6 is a bit more spacious and taller than the Kingdom 6, but it is also heavier and bulkier.