the present invention concerns a beverage preparation capsule defining a closed chamber for enclosing a mass of soluble and / or extractable food material , for use in a beverage preparation machine , comprising : a capsule body with side walls , a bottom wall open with a dispensing opening , said capsule body walls comprising an injection - moulded oil - based or biomass - based thermoplastic material , which is not a gas - barrier material , a gas and moisture impermeable top membrane , pierceable by injection means of the machine which are adapted to inject an extraction liquid under pressure inside said chamber , and a gas and moisture impermeable bottom membrane sealed inside the capsule body near the bottom wall , means adapted to open said chamber by relative engagement with the bottom membrane under the effect of the liquid pressure increase in the chamber during injection of said liquid , characterized in that the inside or outside surface of the capsule body is at least partially covered by a gas -, and optionally moisture -, impermeable label permanently attached by in - mould labelling to said capsule body wall , said label having a tridimensional shape such that the labelled capsule is gas and moisture tight .