improved merchandise bag with reinforced bag wall is formed of thinner than normal specially selected film material with a thickened center section . for merchandise bags , the thickened center section provides a stronger bag bottom and stronger areas for the formation of bag handles . handle bags include soft loop , round die cut oval die cut , wave top , patch and rigid handles . for t - shirt style bags , thinner plastic in the gusset and handle areas is made up for by multiple layers of film in these regions . t - shirt bags may have single , triple or folded gussets providing as many as eight layers of film in these regions . the thickened center section will substantially match the thickness of the gusseted areas and provide for a more easily stacked bag . the bags are formed of mono layer or multi - layer film and at least a portion of the bag walls is corona treated to improve adhesion .