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A capsule, system and method for preparing a predetermined quantity of beverage suitable for consumption using an extractable product is shown. The capsule includes a circumferential first wall, a second wall closing the circumferential first wall at a first end, and a flexible sheet-shaped perforat

A capsule, system and method for preparing a predetermined quantity of beverage suitable for consumption using an extractable product is shown. The capsule includes a circumferential first wall, a second wall closing the circumferential first wall at a first end, and a flexible sheet-shaped perforate and/or porous third wall closing the circumferential first wall at a second, open, end opposite the second wall. The first, second and third wall enclose an inner space including the extractable product. The third wall forms an outermost boundary of the capsule in an axial direction thereof. The third wall comprises a woven or nonwoven filtering material, such as filtering paper.

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1. A system for preparing a predetermined quantity of beverage suitable for consumption using an extractable product, the system comprising: an exchangeable capsule; andan apparatus comprising a fluid dispensing device for supplying an amount of a fluid, under a pressure of at least six bar to the e

1. A system for preparing a predetermined quantity of beverage suitable for consumption using an extractable product, the system comprising: an exchangeable capsule; andan apparatus comprising a fluid dispensing device for supplying an amount of a fluid, under a pressure of at least six bar to the exchangeable capsule, and a receptacle for holding the exchangeable capsule;wherein the exchangeable capsule comprises: a circumferential first wall, wherein the circumferential first wall is frustoconical,a second wall closing the circumferential first wall at a first end, wherein the second wall is integral with the circumferential first wall,a flexible sheet-shaped perforate and/or porous third wall closing the circumferential first wall at a second, open, end opposite the second wall, andan outwardly extending rim, wherein the third wall is attached to the outwardly extending rim,wherein the first, second, and third wall enclose an inner space comprising the extractable product,wherein the third wall forms an outermost boundary of the capsule in an axial direction thereof, andwherein the third wall comprises filtering paper or a nonwoven filtering material;wherein the fluid dispensing device is arranged for supplying the fluid to the extractable product under the pressure of at least six bar through the second wall for forming the beverage;wherein the receptacle comprises a support surface, and the third wall is arranged to abut against the support surface for draining the prepared beverage from the capsule through the third wall and through the support surface;wherein the support surface comprises an abutting area intended for said abutment with the third wall, which abutting area comprises ridges having a substantially non-straight form;wherein channel shaped grooves are formed between the ridges in a side of the support surface facing the third wall, for draining the prepared beverage from the capsule through the grooves;wherein the ridges have a convex top;wherein the ridges comprise edges;wherein the edges are not sharp; andwherein the edges have a radius of curvature of at least 50 μm. 2. The system according to claim 1, wherein the third wall has a sufficiently high tear strength and/or forms a sufficiently low flow resistance that the third wall, in use, does not tear and/or rupture and stays intact. 3. The system according to claim 1, wherein the capsule is free from a support structure for supporting the third wall downstream of the third wall. 4. The system according to claim 1, wherein the third wall is provided with a plurality of exit openings. 5. The system according to claim 4, wherein the plurality of exit openings is distributed over substantially the entire surface of the third wall. 6. The system according to claim 1, wherein the second wall is perforate and/or porous. 7. The system according to claim 6, wherein the second wall has a sufficiently high tear strength and/or forms a sufficiently low flow resistance that the second wall, in use, does not tear and/or rupture and stays intact. 8. The system according to claim 1, wherein the second wall is formed by: a flexible porous sheet,a flexible foil provided with a plurality of entrance openings, orwherein the second wall is substantially rigid and comprises a plurality of entrance openings. 9. The system according to claim 8, wherein the plurality of entrance openings is distributed over substantially the entire surface of the foil or the second wall, respectively. 10. The system according to claim 1, wherein the capsule is provided with a plurality of side-entrance openings arranged in the circumferential first wall. 11. The system according to claim 7, wherein the entrance openings and/or side-entrance openings have a circular cross section. 12. The system according to claim 11, wherein the cross section of the entrance openings and/or side-entrance openings tapers towards the inner space. 13. The system according to claim 8, wherein the entrance openings and/or side-entrance openings are slits. 14. The system according to claim 8, wherein the entrance openings and/or side-entrance openings are arranged to open under fluid pressure. 15. The system according to claim 1, wherein the entire inner space is occupied by the extractable product. 16. The system according to claim 1, wherein the capsule comprises an inwardly extending rim, wherein the second wall or the third wall is attached to the inwardly extended rim. 17. The system according to claim 1, wherein the second wall and/ or the third wall extends to the circumferential first wall. 18. The system according to claim 1 , wherein the capsule further comprises a bottom seal at least partially removable connected to the second wall for sealing the second wall prior to use. 19. The system according to claim 1, wherein the capsule further comprises a lid seal at least partially removable connected to the third wall for sealing the third wall prior to use. 20. The system according to claim 19, wherein the lid seal is arranged to be partially released from the third wall under the effect of fluid pressure in the inner space, while remaining attached to the third wall at at least one position. 21. The system according to claim 1, wherein the capsule comprises stiffening ribs integral with the circumferential first wall. 22. The system according to claim 1, wherein the extractable product comprises roasted and ground coffee. 23. The system according to claim 1, wherein the extractable product is compacted into a tablet. 24. The system according to claim 23, wherein the tablet comprises at least one bore extending from the side of the tablet facing the second wall in the direction of the third wall. 25. The system according to claim 1, wherein the extractable product is compacted into a plurality of tablets. 26. The system according to claim 1, wherein the circumferential first wall is substantially rigid. 27. The system according to claim 1, wherein the ridges and the third wall are adapted to each other such that the third wall, in use, does not tear or rupture against the ridges. 28. The system according to claim 1, wherein the third wall is adapted to the ridges such that the third wall, in use, does not tear or rupture against the ridges. 29. The system according to claim 1, wherein the ridges form at least 10 % of the portion of the support surface which, in use, coincides with the portion of the surface area of the third wall overlying the second, open, end. 30. The system according to claim 1, wherein, in use, the third wall is supported by the ridges over at least 10 % of the portion the surface area of the third wall overlying the second, open, end. 31. A method for preparing a predetermined quantity of beverage suitable for consumption using an extractable product, the method comprising: providing an exchangeable capsule, comprising a frustoconical circumferential first wall, a second wall closing the circumferential first wall at a first end, wherein the second wall is integral with the circumferential first wall, and a flexible sheet-shaped perforate and/or porous third wall closing the circumferential first wall at a second, open, end opposite the second wall, wherein the first, second and third wall enclose an inner space comprising the extractable product, wherein the capsule comprises an outwardly extending rim, wherein the third wall is attached to the outwardly extending rim, wherein the third wall forms an outermost boundary of the capsule in an axial direction thereof, and wherein the third wall comprises filtering paper or a nonwoven filtering material;providing an apparatus comprising a receptacle for holding the exchangeable capsule, a fluid dispensing device for supplying an amount of a fluid under a pressure of at least six bar to the exchangeable capsule, and an outlet which, in use, is in fluid communication with the capsule for draining the prepared beverage from the capsule and supplying the beverage to a container such as a cup, wherein the receptacle comprises a support surface, wherein the support surface comprises an abutting area intended for said abutment with the third wall, which abutting area comprises ridges having a substantially non-straight form, wherein channel shaped grooves are formed between the ridges in a side of the support surface facing the third wall, for draining the prepared beverage from the capsule through the grooves, wherein the ridges have a convex top, wherein the ridges comprise edges, wherein the edges are not sharp, wherein the edges have a radius of curvature of at least 50 μm;arranging the exchangeable capsule with the third wall in abutment with the support surface of the receptacle; andsupplying the fluid under the pressure to the extractable product for preparing the beverage. 32. The method according to claim 31, wherein: the receptacle comprises second wall piercing means intended for piercing the second wall of an alternative capsule for creating at least one entrance opening for supplying the fluid to the extractable product through said at least one entrance opening; andthe second wall of the capsule comprises an entrance filter, for supplying the fluid to the extractable product therethrough, which entrance filter, in use, is positioned at a distance from the second wall piercing means, such that the capsule of the system is not pierced by the second wall piercing means and the second wall stays intact. 33. The system according to claim 8, wherein the second wall is formed by a sheet of filtering paper. 34. The system according to claim 8, wherein the second wall is formed by a polymeric film provided with a plurality of entrance openings. 35. The system according to claim 10, wherein the entrance openings and/or side-entrance openings are slits. 36. The system according to claim 10, wherein the entrance openings and/or side-entrance openings are arranged to open under fluid pressure. 37. The system according to claim 25, wherein the tablets have mutually different packing densities.