In a paper/film composite structure, the film is made of a low substituted cellulose ether having a molar degree of substitution with alkyl and/or hydroxyalkyl groups in the range of 0.05 to 1.3. The paper/film composite structure can be delivered to the waste paper recycling process without previously removing the film portion. The strength of film is increased without adding to the manufacturing cost. The paper/film composite structure is inexpensive and eliminates the risk of film rupture during the working, transporting and use stages.