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 *bund- (source also of German bündel "to bundle"), from PIE root *bhendh- "to bind." 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 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, from the notion of packing one's effects for a journey. To bundle up "wrap in warm heavy clothes" is from 1853. Related: Bundled; bundling.