Core Viewpoint - The article discusses the issues faced by consumers using PVC-coated canvas bags in cold weather, particularly in Northeast China, where low temperatures cause these bags to become rigid and difficult to open [1][7]. Group 1: Material Characteristics - PVC-coated canvas bags are popular due to their durability and water resistance, but they have a significant flaw in cold temperatures, where the material becomes hard and inflexible [3][7]. - The rigidity is caused by the molecular structure of PVC, which becomes less mobile at low temperatures, leading to crystallization and reduced flexibility [7][9]. Group 2: Consumer Impact - Many consumers have reported difficulties with their PVC-coated bags freezing and becoming unusable in Northeast China's winter [1][9]. - Other plastic products, such as jelly bags and EVA materials, also suffer from similar issues in cold weather, leading to potential injuries from broken pieces [9][18]. Group 3: Solutions and Recommendations - For those whose bags have frozen, the recommended solution is to bring them indoors to warm up gradually rather than forcing them open, which could cause damage [22][23]. - It is advised that consumers opt for non-coated canvas or fabric bags when traveling to cold regions to avoid these issues [25].