Tupperware Brands Corp. filed for bankruptcy following a years-long struggle with sales declines and growing competition. Publicly-traded Tupperware filed for Chapter 11 bankruptcy protection, listing assets of between $500 million to $1 billion and liabilities of $1 billion to $10 billion, according to its court filing. The company will seek court approval to facilitate a sale process of the business and to continue operating during bankruptcy proceedings, it said in a separate statement.