7lb, 10lb, 15lb Refillable Reusable Ice Pack – Stays Cold for Up to 5 Days – Non-Toxic, Leakproof, and Suitable for Potable Drinking Water – Built Tough, Rolls Up for Easy StorageHOW TO USE COOLERPAK: Fill with water, freeze overnight, then snap it into your cooler. Enjoy long lasting cold for all your adventures. SAVE SPACE: When not in use, simply drain and pack CoolerPak away in a compact size, making it easy to store in your cooler or backpack without carrying unnecessary bulk or weight. SNAP OPTIONS: Utilize CoolerPak's rust resistant snaps to attach multiple packs together for larger coolers or snap them onto the cooler