In 1949, Schjeldahl invented the “ thermoplastic bag construction,“ a polyethylene bag with ridges on its top that were designed to be folded on each other and then sealed using a hot iron.

The passenger airplane masks are “continuous flow” masks, which are different from “diluter demand” masks, which are what the crew have. A diluter demand mask only releases oxygen when the ...

The bag is a status symbol and fetches thousands of dollars on the resale market. Birkin revealed the origin story of the handbag to a Vogue contributor in 2012.