- High quality material: The cooling packs are made from high quality rubber material that is non toxic and environmentally friendly, safe and odorless, compact and lightweight, strong and durable, and reusable. - Right size and capacity: Measures 21 x 5.2 x 10 cm with a capacity of 600 ml. They are lightweight and compact, take up little space, and leave more room for other foods. - Long lasting cooling performance: The slim cooler has strong waterproof and cooling properties that can keep temperatures low for a long time, helping to keep your foods and drinks cold. Ideal for lunch boxes and for freezing at outdoor events. - Easy cleaning and refresh: Simply add water and stir, the ice packs form a gel. Freeze the packs the night before use. After use, rinse and return them to the freezer, ready for the next use. - Practical use scenarios: Keep school or work lunches cold in a lunchbox. Stay cool during outdoor activities such as picnics or sports events. Chill beverages or perishables while traveling or camping.