Flexible liner for FIBC or bag-in-box container systems with improved flex crack resistance

A liner for use in a bulk container, the liner comprising:

• a first flexible portion including a first longitudinal edge, a second longitudinal edge, a first lateral edge generally perpendicular to the first and second longitudinal edges, and a second lateral edge generally perpendicular to the first longitudinal and second longitudinal edges and generally parallel to the first lateral edge, the first portion comprising at least two plies;
• a second flexible portion including a third longitudinal edge, a fourth longitudinal edge, a third lateral edge generally perpendicular to the third and fourth longitudinal edges, and a fourth lateral edge generally perpendicular to the third longitudinal and fourth longitudinal edges and generally parallel to the third lateral edge, wherein the first and second flexible portions are substantially the same size and shape;
• a first seal joining the first and second portions near the first and third longitudinal edges and running generally parallel to the first and third longitudinal edges;
• a second seal joining the first and second portions near the second and fourth longitudinal edges and running generally parallel to the second and fourth longitudinal edges;
• a third seal joining the first and second portions near the first and third lateral edges and running generally parallel to the first and third lateral edges;
• a fourth seal joining the first and second portions near the second and fourth lateral edges and running generally parallel to the second and fourth lateral edges;
• wherein the first portion comprises at least one strip located between plies of the first portion, the at least one strip being sized and shaped smaller than the first portion, wherein the at least one strip includes a first and a second longitudinal edge and a first and second lateral edge, and wherein the first longitudinal edge of the at least one strip is sealed by at least one of the first or third seals and the second longitudinal edge of the at least one strip is sealed by at least one of the second or fourth seals;
• and
• a fitment positioned on the first portion and through the at least one strip, wherein the liner is fillable between the first and second portions through the fitment after said first and second portions have been sealed at the first, second, third, and fourth seals.