In a hot weather due to global warming, you can use this bottle by fastening the cap of a 500 ml PET water bottle, frozen before you go out, into the center part of this invention product, turning both bottles into a dual-layer PET water bottle. In such manner, you can enjoy drinking ice-cold water for up to 8–10 hours without having frost (dew condensation) that occurs when ice is melting.
Starting from the manufacturing process, the invention of the product is made by using materials, such as PET, PP, PE, which are not harmful to the human body. In particular, as the product can be used...