Which plastic is noted for its low stiffness and used in carrier bags?

LDPE, or Low-Density Polyethylene, is recognized for its low stiffness and flexibility, making it an ideal material for items such as carrier bags. This plastic can easily be molded into various shapes and is lightweight, which is particularly advantageous for shopping bags that need to carry various items without adding significant weight to the overall load. Its low-density characteristics allow for more room in a bag while remaining resilient enough to handle daily use. LDPE also possesses excellent resistance to chemicals and moisture, enhancing its usability for carrying various products.

In contrast, the other plastics mentioned have different properties: HDPE (High-Density Polyethylene) is stiffer and more opaque than LDPE, often used in containers that require more strength and durability. PET (Polyethylene Terephthalate) is known for its rigidity and is commonly found in bottles and food packaging. PC (Polycarbonate) is a very strong and impact-resistant plastic; however, it is not suitable for flexible applications like carrier bags, as it lacks the necessary softness and pliability. These factors clearly highlight the unique suitability of LDPE for carrier bags compared to the other options.