You've found a vintage Igloo cooler plastic sandwich container. For an Igloo MiniMate side button cooler, this white plastic sandwich container, marked "Igloo Products Corp, Houston Texas, made in USA," measures 5.5 x 1 7/8" on the outside, and 5 1/8 x 1.75" on the inside. It has minor marks from light use; it is chip-, crack-, stain-, and melt-free. From the mid-1990s.
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