- Exceptional Cold Retention: The coarse ice crystal particles provide superior expandability, ensuring lasting cooling performance. Keep your food and drinks cool for hours, perfect for picnics, road trips, or everyday lunches. - High-Quality Material: Constructed from thickened PE, these ice packs are built to last. Their durable design resists damage and maintains effectiveness over time, making them ideal for all your meal preservation needs. - Portable Design: Compact and lightweight, these ice packs easily fit into backpacks or lunch bags. Enjoy effortless mobility and reliable cooling performance whether you're at work, school, or enjoying outdoor activities. - Simple to Use: Just add water to the pack to activate the ice crystal expansion, then freeze for 2-4 hours. This straightforward method ensures your lunch container stays chilled and fresh throughout the day. - Versatile Applications: Whether you're packing a healthy lunch for the office, keeping drinks cold for a family outing, or preserving perishable items during travel, these ice packs are designed for a variety of uses.