What do bundles mean?

Answer 1

A skein is the small bundle one would buy at a craft store.

A hank is a bundle of skeins. Defined as follows:

a traditional measure of length for yarn. The length of yarn in a hank varies with the market and the material; for example, a hank of cotton yarn traditionally included 840 yards (768 meters) of yarn, while a hank of wool yarn was 560 yards (512 meters). For both cotton and wool, these traditional hanks are equal to 7 leas or to 12 cuts. In the U.S., however, a hank of woolen yarn is generally 1600 yards (1463 meters). In retail trade, a hank is often equal to 6 or 7 skeins of varying size.

(http://www.unc.edu/~rowlett/units/dictH.html#hank)

Answer 2

A bundle is a bunch of things put together such as a bundle of corriander.