Abstract: A riser bundle comprising a number of risers (2) extending in a wave configuration from the bottom of a body of water up to a floating vessel or the like, the riser bundle (1) along its length being provided with means giving different portions (5, 6 7) along the wave configuration different submerged weight and net buoyancy. The risers (2) are arranged around a centrally extending tube (3) and are surrounded by a tubular outer casing (4), the central tube (3) and the interspaces (8) between the risers (2), along different portions of the wave configuration in operation being filled with materials of different density. Thereby there is achieved at least one light portion (5) of the configuration having a desired positive net buoyancy, and a heavy portion (6 resp. 7) on each side of the light portion (5) having a desired positive submerged weight.