1. PERFORMANCE EXPANSION Our ice crystal box contains efficient dry particles that expand significantly upon water absorption. The large capacity ensures longlasting cooling and reusability, making it an essential companion for air conditioners, fans, ice packs, and portable coolers. 2. DURABLE These leakproof freezer packs for refrigerators are made of thickened PE, ensuring sturdiness, durability, and easy cleaning. The spacesaving cooler bag design fits in lunch boxes, coolers, or even insulated bags, providing safe and reliable cooling. 3. LONGLASTING COOLING Use the ice crystal boxes for portable air conditioners or AC fans to enjoy continuous cool air. The reusable, longlasting ice packs offer insulation and remain reliable even in extreme heat. 4. EASY TO USE Simply add water, let the crystals expand, and freeze for 2–4 hours. These reusable freezer blocks are ideal for lunch box ice packs, mini shock coolers, and daily meal prep.