Hi @daisylou I've traveled with Forteo using this medicine cooler for a continous (more than) 7 days without a refrigerator. This one has a digital display on the lid for peace of mind. You could either plug into an electric outlet or use TSA-approved power banks as source of power. I alternated two 27200mAh power banks which lasted the cooling for at least 36 hours without any electric outlets. Of course I'd need to recharge the power banks for further continous use of the cooler. But it worked beautifully with unknown refrigeration status during travel and at destiny.

Note you could also use the gel as well. The gel needs to be frozen overnight first, and you'd want to test temp of the cooler before putting in your pen to avoid freezing of the pen. When gel is used, there won't be any temperature display however you can test how long the gel will keep the temp as desired. Mine was about 18 hours or so, it seems ambient temp could influence the length.

This cooler holds one pen. You could double check. There was a member posted that s/he got a good price at manufacture site around 140 vs 199 at Amazon:
https://www.amazon.com/dp/B08J6WQZ2P/ref=twister_B09T3NVV1C?_encoding=UTF8&th=1