Whether you're packing a cooler for a weekend camping trip or keeping lunch cold on a long commute, the Cooler Shock 13” x 10” x 1.4” hard ice packs give you reliable, long-lasting cold that actually holds up. Each pack fills with water, seals with a screw cap, and once your Cooler Shock formula is frozen, it stays at 18°F for up to 24 to 48 hours, outperforming standard ice blocks and eliminating the mess that comes with them. At 5 lbs when filled, each pack replaces up to 7 lbs of loose ice, making it a practical upgrade for large lunch boxes, soft coolers, beach bags, and picnic totes. The food-safe, non-hazardous formula means you can pack it right alongside snacks, meats, fruits, sodas, and even breast milk without worry. These slim, hard-shell packs are built to fit snugly in tight spaces without taking up unnecessary room, so your cooler stays organized and your food stays fresh from the first hour to the last.