Equipment is generally similar to that carried in temperate conditions. Extremes of temperature occur in desert areas, ranging from hot days to very cold nights. A light-or medium-weight sleeping bag is normally carried, plus spare clothing to adjust body insulation according to night temperatures. Tents are needed for the same reason, and to provide protection from insects, cold winds and the occasional rainstorm. Tents should be fitted with mosquito nets so that the flaps can be left open for ventilation. A water bag and water bottles capable of carrying nine litres are essential for every party member in outback regions, particularly in warm weather. A rubber or plastic tube with a 5 mm bore and about 1 m long is useful for sucking up water at soaks.