In the Greek myth of Pandora's Box, hope remained inside the jar after Pandora released its evils.
Hesiod’s Works and Days says that Pandora lifted the lid of the large storage jar, allowing diseases, toil, and other troubles to escape into the world. She closed it before the final occupant could leave. The Greek word usually translated as “hope” is elpis.
The story does not plainly say whether hope was meant as a blessing, a trapped good, or something whose absence would have been worse. That ambiguity has produced several interpretations. The familiar English phrase “Pandora’s box” also comes from a translation mistake: Hesiod described a pithos, or large jar, not a small box.
Hope is therefore the only named thing traditionally associated with what remained inside. The myth does not say that Pandora deliberately chose to preserve it; the jar’s closing is simply part of the narrative.