You've found a vintage Igloo cooler plastic sandwich container. For an Igloo MiniMate side button cooler (it rests on the top of the opening), 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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