A harness for breathing apparatus, comprising a structural support member 10 having a front for accommodating a gas cylinder and a rear for facing the back of a wearer, and left and right sides. Left and right shoulder straps 110, 120 are disposed towards the left and right sides of the structural support member respectively, and each shoulder strap has a first end attached to an upper portion of the structural support member and a second end attached to a lower portion of the structural support member. A plurality of flexible conduits 140, 150 extend from a lower portion of the structural support member along the structural support member, each to a position on either the left or right shoulder strap. Left and right guide channels 30, 32 extend longitudinally along the structural support member along left and right sides respectively, for accommodating the flexible conduits.