I doubt you would need a heat pack this time of the year. Depending on the temps. where you are and where you are shipping to, you might need a cool pack this time of the year. Here's an older thread about shipping. https://www.chameleonforums.com/shipping-babies-tell-me-how-do-41072/
i don't think you'll need a heat pack now but obviously that depends on where your shipping to and from. but the kind of heat pack you want is a 40 hour heat pack. idk where you can buy it from besides buying it online.