I use this one when I travel. It is from "4 All Family". The site says that their product provides 52 hours of cooling, so that should be more than sufficient for your travels. They have two sizes: medium and big. I purchased the big size. It doesn't take up too much room in my carry-on backpack. On the website there are pictures that tell how many of each brand of medication can fit in the medium and/or the big size.

Note: when I purchased this product a year ago, the "4 All Family" site said the product was backlogged. However, the product was readily available on Amazon.

https://4allfamily.com/products/cool...47317365850458