Patent ID: 8556508

Claim:
A bag ( 1 , 101 , 201 ), comprising: two opposite faces ( 1 a , 1 b ) joined together around an entire periphery except for one longitudinal edge, the two joined faces forming an interior with an opening ( 1 d ) at said longitudinal edge, the two joined faces forming a rim at the opening sized to be positioned over a peripheral edge of a container, the two faces of the bag being welded to one another along two opposite lateral edges ( 2 , 3 ), and a first face of the two faces having, near said opening, an elastic band extending from a first of the two lateral edges to a second of the two lateral edges, the elastic band being joined to said first face at each of the two lateral edges, and also joined to the first face at an intermediate joining position between the two lateral edges such that a first length (L 1 ) of the elastic band between each of the two lateral edges is greater than a second length (L 2 ) of the elastic band between the intermediate joining position and an other joining position, said second length (L 2 ) corresponding to an effective relaxed length of said elastic band, and the elastic band being free of adhesion to said first face along an entirety of the second length (L 2 ), and the second length (L 2 ) of the elastic band having an elasticity sufficient to, when the rim is positioned over the peripheral edge of the container, i) stretch over the opening to a position on a second of the two faces and ii) exert an elastic force sufficient to hold the rim onto the peripheral edge of the container.