Abstract: A housing for an exhaust gas treatment component includes a casing having a first thickness and a first length and at least one sleeve having a second thickness and a second length. The at least one sleeve is at least partially in contact with the outside of the casing and is connected thereto. The second length of the at least one sleeve is shorter than the first length of the casing. An exhaust gas treatment component, an exhaust gas system and a motor vehicle are also provided.

Abstract: A honeycomb body includes a honeycomb structure through which a fluid can flow and which is disposed in a tubular casing that is substantially gas-impermeable in a radial direction. The tubular casing includes at least one inner tubular casing part and at least one outer tubular casing part, in which at least the outer tubular casing part has cutouts at least in a subregion. The tubular casing has a reduced weight as compared to standard tubular casings, yet nevertheless has the same mechanical stability and gas-tightness. It is also possible to form the tubular casing with thermal expansion properties which are adapted to a subsequent use.