A yarn box is a packaged collection of yarn and related materials assembled for knitting, crocheting, weaving, or other fiber crafts. In the US, yarn boxes may contain full-size skeins, mini skeins, patterns, tools, or accessories, depending on the box format. Contents can be organized around a particular color palette, fiber type, season, project, or crafting technique. Yarn boxes may be offered as one-time packages or recurring deliveries through subscription-based services. Product information can include yarn weight, fiber content, yardage, color details, care instructions, and project guidance. The contents and quantity vary according to the specific box and its intended crafting purpose.