Hybridization usually improves interfacial interaction between the components and ensures higher performance characteristics of materials. Hybridization is also used as a tool for structure perfection of multi-phase polymer systems, including, nanocomposites, namely distribution of nanoscale fillers within polymer matrix is improved. Hybridization can be also used for substituting expensive polymer additives with cheaper ones, without losing much of performance characteristics of the composites. It has been shown [1] that in the presence of nanoclay in the polymer based (epoxy, polypropylene, polyethylene, polyamide 6, polyimide) composites percolation threshold is reduced and electrical conductivity, as well as elastic modulus is increased generally due to improved dispersion degree of the conductive nanofiller (graphene, SWCNT, MWCNT, CB) because of reduced re-agglomeration tendency during processing. It has been also shown that geometrically different carbonaceous nanostructures (graphene, SWCNT, MWCNT, ND, CB) prevent agglomeration within the polymer matrix (generally epoxy, styrene-butadienen rubber and high-engineering thermoplastics such as polyetherimides, polysulphones and polyethersulphones) by formation of a co-supporting network of the separate fillers leading to improved mechanical properties, as well as increased electrical and thermal conductivities.Considering actuality of this topic the current research is devoted to investigation of multi-walled carbon nanotubes (MWCNT) and single layer graphene (SLG) modified polyvinylalcohol (PVOH) hybrid composites obtained via solvent based approach. Polymer nanocomposites have been manufactured by multi-step manufacturing process. Initially stable aqueous dispersions of MWCNTs and SLG have been obtained.