A flexible cover (1) for a food container (4) comprising a flexible film (2) and an elastic thread (3) is presented. The elastic thread (3) is attached to the peripheral edge (8) of the flexible film (2) by a channel (5) formed of the flexible film (2) around the elastic thread (3). The channel (5) exerts a circumferential, compressive force on the elastic thread (3), whereby the elastic thread (3) is fixed to the flexible film (2) by friction between the flexible film (2) and the elastic thread (3), and the elastic thread (3) forms a loop around the peripheral edge (8) of the flexible film (2), the loop having two ends (6, 7) overlapping and abutting in a longitudinal direction of the elastic thread (3). A method for manufacturing a flexible cover (1) is also presented.