Re-closable flexible container for mixing ingredients, kit for baking mix and method of operation thereof

A flexible container for mixing dough, the flexible container comprising:

• a substrate comprising at least first and second surfaces situated between opposing ends and opposing edges;
• a re-closable closure coupled to the substrate and extending at least partially between the opposing edges;
• the substrate being folded at first, second and third folds and coupled to itself at the opposing edges so as to define a gusset situated between the first and third folds, and at least a portion of a cavity configured to receive ingredients for making the dough;
• tabs situated on opposing sides of the gusset and being bonded to each other to seal at least a portion of the cavity;
• and
• a support cavity at the one or more first, second and third folds, wherein portions of the substrate are configured to be coupled together at the first and third folds to create a loop.