LongLasting Chill Effect Expandable coarse particle design delivers robust cold retention, helping meals and drinks stay cool for longer. Durable and Reusable Thickened PE material resists breakage, providing dependable performance for repeated longterm use in lunch boxes. Portable and Easy to Carry Compact, portable ice pack that fits seamlessly into backpacks and lunch bags without adding bulk. Simple and Quick to Activate Start by adding water to initiate the expansion of ice crystal particles, then freeze for about 2 to 4 hours to maintain low temperatures in your lunch box. Key benefits Extended cooling: Keeps food and beverages cold during commute, school lunch, or workday. Reliable durability: Built to withstand repeated use in daily meallowering cooling needs. Convenient portability: Lightweight and compact design for easy transport and storage. Straightforward setup: Quick activation with water expansion and a short freeze time. Specifications and attributes Function: Reusable ice pack for longlasting cold retention. Material: Thickened PE for enhanced durability. Compatibility: Designed to be carried and stored easily, suitable for lunch boxes and backpacks. Performance: Provides stable cooling over extended periods with simple preparation. Use scenarios School or work lunch: Place the ice pack in your lunch box to keep sandwiches, salads, and drinks cool until mealtime. Outdoor activities: Take it on picnics, road trips, or day trips to maintain cold beverages and snacks. Travel or commuting: Use during travel to keep perishable items and drinks at safe temperatures in bags.