A cartridge (10) containing a dose (12) of at least one substance that can be used for preparing a liquid product, said cartridge comprising a side wall (140), a first end wall (142), through which said liquid product is able to flow out of the cartridge (10), and a second end wall (16) of the cartridge (10) at the end opposite to said first end wall (142), wherein said side wall (140), said first end wall (142), and said second end wall (16) comprise a compostable material. At least one, preferably both, of said first end wall (142) and said second end wall (16) have a layered structure comprising at least one layer (1420; 160) of a first compostable material and at least one layer (1422; 162) of a second compostable material, with at least one coating layer (1423) forming a barrier to oxygen and to water vapour sandwiched between said layer (1420) of a first compostable material and said layer (1422) of a second compostable material.