Tupperware Brands, the company well-known for its line of plastic containers for food storage, has filed for Chapter 11 bankruptcy after years of declining sales and growing competition. In a statement on Tuesday night, the publicly-traded company said Tupperware Brands Corporation and some of its subsidiaries voluntarily initiated Chapter 11 proceedings in the U.S. Bankruptcy Court in the District of Delaware. “Tupperware will seek Court approval to continue operating during the proceedings and remains focused on providing its customers with its award-winning, innovative products through Tupp…