This sunny-colored thermos holds 8 ounces, and at the bottom it says:

"Here's Boomer Copyright^© 1980 Paramount Pictures Corporation

My guess is that this was part of a set, it might have come with a Here's Boomer lunch box.

Did you know: The 'vacuum bottle' was invented in 1892 by James Dewar, so it's sometimes called a Dewar, especially in scientific circles

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Bought at Ioffer auctions