A calpack is a type of hat that's popular in many Asian countries, and it's sometimes called a "coolie hat" in English. However, there are many other synonyms for this unique and versatile accessory. For example, some people call it a conical hat or a rice hat, while others might use terms like a straw hat, a sun hat, or a farmer's hat. Depending on the location and cultural context, other synonyms might include a bamboo hat, a palm hat, or even a fisherman's hat. No matter what you call it, a calpack is an iconic symbol of traditional Asian culture, and it's often used for protection from the sun, rain, and wind during outdoor activities and labor.