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Today, lunch boxes are generally made of vinyl, with foam insulation, and an aluminum/vinyl interior. As a result, they’re usually much better at retaining their temperature but are less rigid/protective.
Lunch box collecting is a popular hobby. Many lunch boxes, including those from the 1950s and 1960s sell for hundreds of dollars, some even into the thousands of dollars, see here http://www.greatestcollectibles.com/lunchbox-price-guide/.
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