A recent study has aimed to create hydrophobic paper by exploiting the mechanical properties and water resistance of cellulose nanofibers, and so produce a sustainable, high-performance material suitable for packaging and biomedical devices. This involved a supramolecular approach, i.e., combining short chains of proteins (peptide sequences) that do not chemically modify the cellulose nanofibers. Sustainable hydrophobic paper may one day replace petroleum-related products.