The smaller size toilet is light enough to be easily carried by two people. Very easy to be installed, 2 people can finish one unit within 30 minutes. With flap, the waste can not be seen directly. With vacuum forming, the roof is flexible enough to prevent damage from outside force. With UV-resistance, the toilet can keep its original appearance and function after many years. website: http://www.topplatoilet.com/tpt-l03-non-flush-portable-toilet-waterless-chemial-event-toilet.html