An extension tube for a urinary catheter comprises a tubular body with an inlet opening, an outlet opening and an internal lumen extending between the inlet opening and the opening. The tubular body comprising at least a first layer, which first layer includes natural and/or regenerated cellulose fibers, and preferably to a large extent, such as at least 40 wt %. The tubular body is further arranged to be compressible into a compacted, preferably generally flat, storage state, and to be expandable into an expanded, tubular use state.