Flexible material for flexible package

A flexible material for a flexible package, comprising:

• a first sheet comprising:
• a first panel region disposed between second and third panel regions, an opening panel region being defined in at least one of the first, second, and third panel regions;
• oppositely disposed fourth and fifth panel regions disposed adjacent to opposite ends of the second panel region;
• oppositely disposed sixth and seventh panel regions disposed adjacent to opposite ends of the third panel region;
• and
• oppositely disposed eighth and ninth panel regions disposed adjacent to opposite ends of the first panel region, the eighth and ninth panel regions defining opposed tuck regions, wherein the fourth, sixth, and eighth panel regions cooperate to define a sidewall having a tuck and a seal when the flexible material is configured into the flexible package, and the fifth, seventh, and ninth panel regions cooperate to define an opposed sidewall having a tuck when the flexible material is configured into the flexible package, wherein a boundary is defined between each adjacent ones of the plurality of panel regions, wherein when configured into a package, a fold is formed in the flexible material at each boundary;
• a second sheet attached to a portion of the first sheet in (i) at least a portion of the first panel region, (ii) at least one of the eighth and ninth panel regions defining the tuck fold regions and (iii) at least one of at least a portion of the second panel region and a portion of one or both of the fourth and fifth panel regions, and at least a portion of the third panel region and a portion of one or both of the sixth and seventh panel regions, wherein:
• the second sheet extends over a first boundary between the first panel region and at least one of the eighth or ninth panel regions, and comprises a line of reduced strength at or adjacent to the first boundary,
• the second sheet is attached to portion of the fourth or fifth panel regions and/or the sixth and seventh panel regions such that the second sheet remains outboard of the seal formed when the fourth, sixth, and eighth panel regions and/or the fifth, seventh, and ninth panel regions cooperate to define the sidewall of the package having the tuck and the seal,
• wherein the first sheet comprises one or more corner zones, and the second sheet comprises one or more corner reliefs disposed in the one or more corner zones.