A paper cup (10, 30) configured to hold beverage, comprising: - a base; - a sidewall; - said base and said sidewall together defining a space configured to receive the beverage; - an upper end portion of the cup consisting of a first (14a, 14b) and second pair (14c, 14d) of opposing closure panels, whereby each of the closure panels is attached to an upper edge of the sidewall via a respective first folding line (15a, 15b, 15c, 15d) and to adjacent closure panels via respective second folding lines (16a, 16b, 16c, 16d); - each panel of said first pair containing two additional folding lines (17a, 17b, 17c, 17d), each of which extends from a distal edge of the respective panel to end points of the respective first folding line (15a, 15b), to enable folding inwards; - wherein, in a closed position, a first panel of said second pair is partly inserted below a second panel of said second pair, and the panels of said second pair close the upper end portion; - wherein in the closed position, said closure panels are folded inwards and form a lid of the cup; - wherein the entire lid has a concave shape in the closed position; - wherein the first folding lines (15c, 15d) of the panels of the second pair (14c, 14d) are curved; - wherein the additional folding lines together with the respective first folding line (15a, 15b) of the panels of the first pair (14a, 14b) form a triangle shape with a cut or pointed apex and with a curved base; - wherein each of the panels of the first pair has a length that is less than 50 % of the width of the panels of the second pair; and - wherein each of the panels of the second pair has a length that is greater than 50 % of the width of the panels of the first pair. - a base; - a sidewall; - said base and said sidewall together defining a space configured to receive the beverage; - an upper end portion of the cup consisting of a first (14a, 14b) and second pair (14c, 14d) of opposing closure panels, whereby each of the closure panels is attached to an upper edge of the sidewall via a respective first folding line (15a, 15b, 15c, 15d) and to adjacent closure panels via respective second folding lines (16a, 16b, 16c, 16d); - each panel of said first pair containing two additional folding lines (17a, 17b, 17c, 17d), each of which extends from a distal edge of the respective panel to end points of the respective first folding line (15a, 15b), to enable folding inwards; - wherein, in a closed position, a first panel of said second pair is partly inserted below a second panel of said second pair, and the panels of said second pair close the upper end portion; - wherein in the closed position, said closure panels are folded inwards and form a lid of the cup; - wherein the entire lid has a concave shape in the closed position; - wherein the first folding lines (15c, 15d) of the panels of the second pair (14c, 14d) are curved; - wherein the additional folding lines together with the respective first folding line (15a, 15b) of the panels of the first pair (14a, 14b) form a triangle shape with a cut or pointed apex and with a curved base; - wherein each of the panels of the first pair has a length that is less than 50 % of the width of the panels of the second pair; and - wherein each of the panels of the second pair has a length that is greater than 50 % of the width of the panels of the first pair.