- Long-Lasting Cooling Effect: Designed with expandable coarse particles, these cooling packs provide exceptional cold retention to keep your meals and beverages chilled for hours. - Durable Construction: Made from thickened PE, these lunchbox cooling packs are built to withstand regular use without breaking, ensuring long-term reliability and performance. - Easy to Transport: Their compact size and lightweight design make it simple to slide them into backpacks, allowing for convenient portability while ensuring your meals stay fresh and cold. - Simple to Use: Just add water to activate the ice crystal particles, freeze the pack for 2-4 hours, and enjoy a hassle-free solution for maintaining cold temperatures in your lunch container throughout the day. Use Cases: 1. Perfect for work lunches: Keep your salads, sandwiches, and drinks cool during your commute to the office. 2. Ideal for picnics: Keep food and beverages chilled while enjoying a day outdoors with friends and family. 3. Great for school: Ensure your child's lunch stays fresh and appetizing during school hours with these reliable cooling packs.