A paper-based barrier multilayer packaging material structure being formed as a unitary sheet and comprising from its outer surface to its inner surface, the following layers: (i) at least one layer of a polymer dispersion coating selected within the list of: ethylene-acrylic or methacrylic acid copolymer, vinyl acetate, styrene acrylate, acrylic, modified polyvinylalcohol, ethyl acetate, polyhydroxyalcanoate and their copolymers, polyurethane, polybutylene adipate terephthalate (PBAT), polybutylene succinate, poly(butylene succinate-co-adipate) (PBSA), polylactic acid, or any mixture thereof, with or without a mineral filler, said coating having a thickness of 1 to 10 μm, (ii) a paperboard having a grammage of between 120 g/m 2 and 500 g/m 2, (iii) a layer of water-based or solvent-less adhesive selected within the list of: polyvinylacetate (PVAc), polyurethane, acrylic, polyvinylalcohol (PVOH), ethylenevinylalcohol (EVOH), butenediol vinyl alcohol co-polymer (BVOH), a starch-based adhesive, or a mixture thereof, said adhesive layer having a thickness comprised between 1 μm and 10 μm, (iv) a barrier metallized paper ( MBPL) having substance weight between 30-120 g/m 2, preferably 45 to 90 g/m 2 and a Water Vapour Transmission Rate (WVTR) of 10 to 0.1 g/m 2 /d, preferably a WVTR of 1.0 to 0.1 g/m 2 /d measured at 38°C and 90% RH, and an Oxygen Transmission Rate comprised between 100 and 0.1 cc/m 2 /d, measured at 23°C and 50% RH, preferably an OTR comprised between 1.0 and 0.1 cc/m 2 /d, (v) a water-resistant polyolefin sealable coating of any of the following: low density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or an ethyl-acrylate blend with low density polyethylene (EEA-LDPE), said coating having a thickness of 10 to 50 μm, preferably of 25 to 35 μm, wherein the total fiber contents of said structure is comprised between 85% and 93% by weight. (i) at least one layer of a polymer dispersion coating selected within the list of: ethylene-acrylic or methacrylic acid copolymer, vinyl acetate, styrene acrylate, acrylic, modified polyvinylalcohol, ethyl acetate, polyhydroxyalcanoate and their copolymers, polyurethane, polybutylene adipate terephthalate (PBAT), polybutylene succinate, poly(butylene succinate-co-adipate) (PBSA), polylactic acid, or any mixture thereof, with or without a mineral filler, said coating having a thickness of 1 to 10 μm, (ii) a paperboard having a grammage of between 120 g/m 2 and 500 g/m 2, (iii) a layer of water-based or solvent-less adhesive selected within the list of: polyvinylacetate (PVAc), polyurethane, acrylic, polyvinylalcohol (PVOH), ethylenevinylalcohol (EVOH), butenediol vinyl alcohol co-polymer (BVOH), a starch-based adhesive, or a mixture thereof, said adhesive layer having a thickness comprised between 1 μm and 10 μm, (iv) a barrier metallized paper ( MBPL) having substance weight between 30-120 g/m 2, preferably 45 to 90 g/m 2 and a Water Vapour Transmission Rate (WVTR) of 10 to 0.1 g/m 2 /d, preferably a WVTR of 1.0 to 0.1 g/m 2 /d measured at 38°C and 90% RH, and an Oxygen Transmission Rate comprised between 100 and 0.1 cc/m 2 /d, measured at 23°C and 50% RH, preferably an OTR comprised between 1.0 and 0.1 cc/m 2 /d, (v) a water-resistant polyolefin sealable coating of any of the following: low density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or an ethyl-acrylate blend with low density polyethylene (EEA-LDPE), said coating having a thickness of 10 to 50 μm, preferably of 25 to 35 μm,