A capsule for preparing infusion beverages by circulating an infusion fluid through an infusion product, said capsule comprising: [a] an outer containing body with a first side wall defining a longitudinal direction of said capsule and a first end wall arranged crosswise to said longitudinal direction, and [b] a cover, [c] said outer containing body and said cover being connected to each other at the end of said first side wall opposite to said first end wall, for forming a first inner chamber, [d] said capsule further comprising a first inner duct extending in said longitudinal direction towards the inside of said outer containing body from said first end wall, for fluidly connecting said first inner chamber with the outside of said capsule, and [e] an inner containing body comprising a second side wall, characterised in that [f] said inner containing body is a separate part from said outer containing body, said inner containing body comprising a second end wall, said second end wall having an extraction opening and being permeable such that said infusion beverage can circulate across said second end wall, [g] said inner containing body being arranged upside down, inside said outer containing body, with said extraction opening fitted around said first inner duct and said second side wall bearing, with the end of said second side wall opposite to said second end wall, against said first end wall of said outer containing body for forming a second inner chamber fluidly connected with said first inner chamber, [h] said capsule further comprising a closing layer for closing in a fluid-tight manner said second end wall at the side thereof facing the outside of said inner containing body, such that said infusion beverage after crossing said second end wall is directed towards said first inner duct. [a] an outer containing body with a first side wall defining a longitudinal direction of said capsule and a first end wall arranged crosswise to said longitudinal direction, and [b] a cover, [c] said outer containing body and said cover being connected to each other at the end of said first side wall opposite to said first end wall, for forming a first inner chamber, [d] said capsule further comprising a first inner duct extending in said longitudinal direction towards the inside of said outer containing body from said first end wall, for fluidly connecting said first inner chamber with the outside of said capsule, and [e] an inner containing body comprising a second side wall, characterised in that [f] said inner containing body is a separate part from said outer containing body, said inner containing body comprising a second end wall, said second end wall having an extraction opening and being permeable such that said infusion beverage can circulate across said second end wall, [g] said inner containing body being arranged upside down, inside said outer containing body, with said extraction opening fitted around said first inner duct and said second side wall bearing, with the end of said second side wall opposite to said second end wall, against said first end wall of said outer containing body for forming a second inner chamber fluidly connected with said first inner chamber, [h] said capsule further comprising a closing layer for closing in a fluid-tight manner said second end wall at the side thereof facing the outside of said inner containing body, such that said infusion beverage after crossing said second end wall is directed towards said first inner duct.