In the food product packaging industry lots of initiatives have actually been (and also are) devoted to the development of brand-new products in order to reply to an urgent market demand for eco-friendly and eco-sustainable items. Specifically a lot of interest is currently devoted both to making use of compostable and also biobased polymers as ingenious and promising option to the currently used petrochemical derived polymers, as well as to the re-use of waste products originating from agriculture as well as food industry. In this work, multifunctional eco-sustainable systems, based upon poly(lactic acid) (PLA) as biopolymeric matrix, diatomaceous earth as enhancing filler and invested coffee grounds essence as oxygen scavenger, were produced for the first time, in order to provide a synchronised improvement of mechanical as well as gas barrier residential or commercial properties. The impact of the diatomite and the invested coffee premises extract on the microstructural, mechanical as well as oxygen obstacle homes of the created movies was deeply examined by means of X-Ray diffraction (XRD), infrared spectroscopy (FT-IR, ATR), scanning electron microscopy (SEM), uniaxial tensile examinations, O2 permeabilimetry dimensions. An enhancement of both mechanical and also oxygen obstacle buildings was taped for systems qualified by the co-presence of diatomite as well as coffee premises extract, recommending a feasible synergic effect of both additives.