How do I keep insulin cool while traveling?
Last updated September 3, 2026.
Carry insulin in your hand luggage with a gel pack or insulated case - never in checked bags or a hot car. The CDC advises packing twice as much medicine as you think you need and keeping supplies within reach. US airport security allows diabetes liquids over 3.4 ounces when you declare them, and pump or CGM wearers can request a hand inspection instead of X-ray.
What to do
- Carry on, always. Cargo holds and car trunks hit temperature extremes that destroy insulin.
- Use a gel pack, not loose ice. Direct ice contact can freeze the insulin, and frozen insulin is ruined.
- Declare supplies at security. Diabetes liquids are exempt from the 3.4-ounce rule; say so at the checkpoint.
- Refrigerate on arrival. Move unopened insulin into a fridge; in-use pens and vials can stay at room temperature within their labeled window.
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