Be sure to buy at least one of these reusable icepacks if you are ordering heat-sensitive sweets such as chocolate or gummies during the summer months. Depending on the time in transit, weather conditions, and the size of your order, you may want to buy more than one icepack. Icepacks help keep things cool for as long as 3 days, but in very hot weather they can lose their cooling power in as little as 24 hours. Additional icepacks will help maintain a cooler temperature longer.