The invention proposes a film (1) for a skirt (2) of a flexible tube (3) one end of which is intended to be closed by a tube head (4), said multilayer film being intended to be folded on itself and heat-sealed along the length of a longitudinal seal line (6) in such a way as to form the skirt (2) so that a first layer (10) of the multilayer film (1), known as the inner layer, is heat-sealed to a second layer (20) of the multilayer film (1) opposite the first layer, known as the outer layer, characterised in that: —the inner layer (10) comprises a polymer or a blend of polymers with a Young's modulus of at least 1600 MPa, and—the outer layer (20) is made of a biaxially-oriented film.