Insulin Cooler Cooling Bottle Bi-Medicine cooler flask can keep 4℃ for about 36 hours under ambient 40℃, 2-25℃ for 72 hours

I purchased this to hold Two Trulicity pens and One Lantus pen. THe opening at the top is not large enough for a Trulicity pen. I returned it.I did however test it. Yhe representations for how lomng it wiull hold the temperature are accurate.I love it because it will hold te cold and I wish that I cooud have used it.

This definitely works.