Nepenthes rajah is most famous for the giant urn-shaped traps it produces, which can grow up to 41 cm high[5] and 20 cm wide.[6] These are capable of holding 3.5 litres of water[7] and in excess of 2.5 litres of digestive fluid, making them probably the largest in the genus by volume. Another morphological feature of N. rajah is the peltate leaf attachment of the lamina and tendril, which is present in only a few other species.