The duration of ice retention in a cooler depends on various factors, including the cooler's insulation, ambient temperature, and how often it's opened. In well-insulated coolers, ice can last anywhere from 1 to 7 days or more.

Both ice packs and loose ice can be used, but ice packs are generally less messy and prevent food items from getting wet as they melt. Loose ice can help fill gaps in the cooler and provide better cooling.

Yes, coolers can also keep hot foods or beverages warm for a limited time. Preheat the cooler with hot water before adding hot items for better insulation.

After each use, clean and thoroughly dry your cooler. Store it with the lid open to allow air circulation. Baking soda or activated charcoal can also help absorb odors.

It's possible to use coolers for glass bottles, but it's essential to pack them securely to prevent breakage during transport.