The Collaborative International Dictionary
pack thread
packthread \packthread\, pack thread \pack thread\n. A strong three-ply thread or small twine used to sew or tie packs or packages.
Usage examples of "pack thread".
This messenger, forsooth, is nothing but a gallows bird - a fellow the city marshal was going to hang, but unfortunately put it off till he should be starved enough to save rope and be throttled with a pack thread.
My lingerie was a disgrace, shabby gray cotton I'd mended with pack thread.