Cooler Shock Reusable Ice Packs - Long Lasting Cold Freezer Packs, Camping Gear. LASTING COLD - Our durable ice packs for coolers and lunch boxes are colder than ice at 18 F (-8 C) to keep your favorite foods and soft drinks chilled for up to 48 hrs. EASY TO USE - Filling these thin reusable cooler packs is easy freezy! Simply, add water once using the included funnel, shake, screw cap on, freeze until ready to use. STRONG - Robust and resilient, these cooler and lunch box ice packs are nylon-reinforced for seamless freezer-to-lunch bag trips. COOLER SIZE - This large ice pack is perfectly designed to keep food and drinks cold inside beach bags, picnic baskets, coolers for breastmilk storage, and more. THOUGHTFUL GIFTS - If your loved one is an outdoorsy type, you?ll want them to have everything they need when they go off-grid. Our reusable ice packs for coolers are essential camping gifts for anyone planning a well-stocked getaway!