CoolerPak 4lb Refillable Reusable Ice/Heat Pack – Hook & Loop Fastener - Cold for Days, Microwave Safe, Non-Toxic, Leakproof, Suitable for Potable Drinking Water, Built Tough, Roll Up for Easy Storage

["HOW TO USE COOLERPAK: For cooling: Fill with water, freeze overnight, then velcro it into your cooler. Enjoy long-lasting cold for all your adventures. For heating: Fill with water (DO NOT pour boiling water into Coolerpak), microwave in 2 minute increments until reached desired temperature, use as needed. Caution as water may be very hot!","POTABLE DRINKING WATER: CoolerPak meets FDA and Prop 65 standards, so add potable water to freeze and get safe drinking water once melted! EXTENDED HEATING: CoolerPak's large capacity helps keep your food warm for extended periods of time.","COOLER ATTACHMENT: Attach to your hard or soft cooler with the included velcro strips, form freestanding walls, or attach multiple packs together for larger coolers.","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.","BUILT TO LAST: Crafted from 600D TPU flexible fabric, CoolerPak is built to withstand rugged outdoor adventures while maintaining its cooling or heating capabilities. PATENT: US 12,480,700 B2"]