The present invention relates to a cylinder-piston system, comprising at least one cylinder (102), at least one piston (201) configured for a reciprocating linear motion inside the cylinder (102), and at least one rotating shaft system (304, 808, 306, 203) configured for cinematically converting the reciprocating linear motion of the piston (201) into a rotating motion of the shaft (304), wherein the piston (201) and the cylinder (102) have corresponding rectangular cross-sections on a plane transversal to the direction of the linear motion, and wherein the piston (201) comprises sealing elements (501, 601) configured for providing a seal between the walls of the piston (201) and the walls of the cylinder (102) which surround the piston (201), so as to avoid leakage in there between; the sealing elements (501, 601) comprise a first series of sealing elements (501) adjacent to each other at first joining zones on the transversal plane, so as to include a complete perimeter of the piston (102) at the transversal plane, and further comprise a second series of sealing elements (601) adjacent to each other at second joining zones on the transversal plane, so as to include a complete perimeter of the piston (102) at the transversal plane; the first series of sealing elements (501) is axially overlaid on, and in contact with, the second series of sealing elements (601) with respect of the direction of the linear motion; the first joining zones are different from the second joining zones with respect of the transversal plane. The present invention also relates to a reciprocating engine (101), such as an internal combustion engine, comprising a cylinder-piston system.