Veronica, my husband and I recently traveled out of the country for 3 weeks. I purchased a “4AllFamily Explorer 72 Hours 1-7 pen Medical Insulin Cooler Travel Case” from Amazon that worked quite well. It comes with a freezer gel and charger. Knowing I wouldn’t be able to plug it in for 36 hours, it gave me peace of mind knowing my vials would stay cold. If you travel a lot like we do, it’s a great investment. $139.99 and currently there is a coupon for 11% off.