early 14c., "bound collection of things," from Middle Dutch bondel, diminutive of bond, from binden "to bind," or perhaps a merger of this word and Old English byndele "binding," from Proto-Germanic *bundilin (source also of German bündel "to bundle"), from PIE root *bhendh- "tie" (see bend, v.). Meaning "a lot of money" is from 1899. To be a bundle of nerves "very anxious" is from 1938.

1620s, "to make into a bundle," from bundle, n.; meaning "to wrap up in warm heavy clothes" is from 1893. Meaning "to sleep with another, clothed, in the same bed," a noted former custom in New England, is from 1781. Meaning "to send away hurriedly" is from 1823. Related: Bundled; bundling.