Binder carrier pack and corresponding blank

A binder comprising:

• a first panel divided by a first fold line from a second panel which is divided by a second fold line from a third panel, the first and second fold lines being intersected by three slits, the central slit being longer than the first and second outer slits and each end of the central slit being joined to an adjacent end of each of the first and second outer slits by a respective crease line;
• whereby, when the third panel is folded about outer parts of the first and second fold lines to be spaced from yet overlie the first panel, the material between the central slit and the first outer slit is folded about its associated crease lines and the inner parts of the first and second fold lines to form a first strap, and the material between the central slit and the second outer slit is folded about its associated crease lines and the inner parts of the first and second fold lines to form a second strap,
• wherein said first panel is formed with a fastening flap and an opening through which said first and third panels pass to form first and second carrying handles for said binder in a folded position, said first and second carrying handles having apertures therethrough to receive fingers of a user wherein said opening is non-linear and is shaped so that it has end margins located near opposing sides of the aperture of said first panel.