"The Healthy Butcher" branded insulated thermal bags are strong, durable and ideal for carrying either hot or cold items, keeping hot food hot or cold food cold for up to 3 hours. Perfect for those walks home from the store during the spring and summer months, and a handy item to have in your trunk!
"Ultrasonic" refers to how these bags are put together. They're not sewn together but are instead sealed together using a special manufacturing process that makes them extra-strong and durable. The top zipper on these bags helps to retain the internal temperature of the product placed inside of it, whether it be frozen ice cream or hot food from the deli counter.