A capsule (2), system (1) and method for preparing a predetermined quantity of beverage suitable for consumption using an extractable product. The system (1) comprises a capsule (2) comprising a cup (12) having a circumferential wall (16), a bottom (18) at a first end, and a flange-like rim (20) at a second end. The capsule (2) further comprises a lid (14), in use, connected to the flange-like rim (20). The wall (16), bottom (18) and lid (14), in use, enclose an inner space (22) comprising the extractable product. The cup (12) further comprises a plurality of substantially concentric circumferential ridges (28) extending outwardly of the cup (12), wherein the ridges (28) are made of the same material as the cup (12). The system further comprises a beverage brewing device (4) comprising an enclosing member (6) for enclosing the capsule (2). In use, at least one of the ridges (28) abuts against at least a portion of the enclosing member (6), such that a sealing engagement between the capsule (2) and the enclosing member (6) is formed.