In addition to choosing a high-quality insulated bag, you can also extend its life by:
1) Soaking the bag in hot water before use can improve its insulation performance;
2) Adding cold materials, such as ice packs or ice cubes, to the bag can slow the temperature rise inside;
3) If you need to keep food warm for a long time, choose a double-layered insulated bag or use a specialized insulated device, such as an insulated bucket.