Pack thread is a type of string used to tie or bind items together for transport. There are several synonyms for pack thread that can be used interchangeably depending on the context and availability. Some alternatives for pack thread include twine, string, cord, rope, wire, and ribbon. Twine is similar to pack thread in terms of strength and thickness, but it is typically made from natural fibers like hemp or cotton. String refers to any thin and flexible material that can be used to tie or hold things together. Cord is a thicker and more durable version of pack thread, often used for heavy-duty applications. Rope and wire come at different strengths and thickness, perfect for more technical applications. Ribbon often serves decorative purposes and is made from the more delicate material.