shares of tupperware brands corp tup fell more than 10 in afterhours friday after the maker of iconic containers and other plasticware and kitchen implements said in a filing that it entered a waiver agreement with some of its creditors but warned it may not have money for an interest payment this month the filing repeated goingconcern warnings with tupperware saying that despite the waiver it forecasts being out of compliance with certain aspects of its credit agreement and having “insufficient liquidity” to make the payment shares of tupperware once a staple in middleclass homes across the us and a toehold in the job market for countless women with its directtoconsumer model have dipped under 1 and the company’s market capitalization hovers around 33 million