Coal bags, also known as coal sacks or coal sacks, were a common item used to transport coal in the past. However, with the decline of using fossil fuels and increasing concerns about the environment, the use of coal bags has decreased. Nowadays, more sustainable materials, such as jute or cotton, are used as alternatives for carrying various types of materials. Some other synonyms for coal bags include burlap bags, hessian sacks, and gunny sacks. Burlap bags are made from a sturdy and plain-woven fabric that is breathable, making it an ideal material for transporting heavy items such as coal. Hessian sacks, on the other hand, are made from hessian cloth, which is a type of woven fabric that is often used for industrial purposes. Gunny sacks, made from a coarse and heavy cotton weave, are also commonly used for storage and transportation of heavy materials.