20 parts, in particular made of plastic, for packaging containers made of plastic, in particular for packaging containers for pharmaceuticals and nutraceuticals; parts, in particular made of plastic, for packaging containers made of plastic with integrated desiccants, in particular for packaging containers for pharmaceuticals and nutraceuticals; packaging containers made of plastic, in particular for pharmaceuticals and nutraceuticals; packaging containers made of plastic with integrated desiccants, in particular for pharmaceuticals and nutraceuticals