How to Keep Insulin Cool While Traveling (Plane Included)
Kaio Dia
What you'll really get from this article
Insulin and heat don't get along. A car parked in the sun for twenty minutes, a beach bag on hot sand, a hotel room with no fridge: sooner or later you wonder whether the pen at the bottom of your bag is still any good.
This guide is about one simple thing: how to keep insulin cool while traveling, by car, on foot, on holiday or on a plane. No fridge, no ice, no batteries. We'll look at what to avoid, how evaporative cooling works, what you can take in your carry-on, and which bags already have the system built in.
What to avoid when it's hot
Think of insulin as a bit like chocolate. It hates heat, but it doesn't like being frozen either. A few simple rules cover most situations:
- Never freeze it, and never let it rest directly against an ice pack. Insulin that has frozen is no good, even if it looks normal once it thaws.
- Skip the glove box and the parcel shelf. A closed car gets much hotter than you'd guess.
- On a plane, keep it in the cabin, never in the hold. Cargo areas can get very cold, and you don't want to find out your suitcase took a detour when your insulin is inside it.
Every insulin has its own storage limits, so check your leaflet. If you're heading somewhere properly hot, ask your diabetes team before you go.
How a cooling wallet works without a fridge
A Dia-Cool insulin cooling wallet works a bit like sweat on your skin. Inside the wallet there's an insert full of hydrogel pearls. You soak it in cold water, the pearls swell and hold the water, and as it slowly evaporates it takes the heat with it. No battery, no ice, nothing to plug in.
In practice:
- It keeps insulin cool for 48 hours or more, depending on the outside temperature.
- It can hold insulin up to 12°C below the air temperature.
- When it stops cooling, you put the insert back in cold water and it starts again.
How to use it, step by step
- First soak: cold water, one hour at most. Pearls left in water for longer get damaged.
- Recharging later: 10 to 15 minutes in cold water, depending on the state of the pearls.
- Before you leave: wipe off the extra water, slide the insert back into the wallet and add your insulin.
- Never put the insert in the fridge or the freezer.
The wallets go from one pen up to four pens or eight vials, so you can pick the size you actually carry. You'll find them all on our Dia-Cool insulin cooling wallets page.
What it can and can't do
The Dia-Cool helps keep insulin at a sensible temperature in the heat, but it isn't a fridge. If you carry a medicine that has to stay close to freezing point, evaporative cooling won't do that job, and you should follow the storage instructions that come with it.
Keeping insulin cool while flying
A Dia-Cool goes in your carry-on bag without any problem. There's nothing electric in it and no ice, so there's not much to explain at the gate. Airlines and airports don't all work the same way, so take a minute to read your airline's page and your departure airport's before you go. A prescription or a short note from your doctor is a sensible thing to have on you, and it's worth packing more supplies than you think you'll use.
A small habit that helps: recharge the wallet the evening before, so it's ready to drop in your bag in the morning.
Bags with the cooling system already built in
Some people don't want a wallet inside another bag. In that case, several of our bags come with the Dia-Cool system built in:
- Dia-Go shoulder bag and the lighter Dia-Go Lite: city breaks and days out.
- Dia-Go Easy: a fanny pack, much nicer than a shoulder bag when you're on your feet all day.
- Dia-Pouch: made for people who wear an insulin pump. The Dia-Pouch Kids does the same for children.
- Kaio-Emergency Pack: a small case for two insulin pens or two EpiPens, and it works well for EpiPens too.
Planning a day at the sea? Our article on a day at the beach with type 1 covers the rest. Walking or cycling? Have a look at hiking or biking with type 1 diabetes. And for the basics on insulin itself, there's Questions about insulin: true or false.
What to pack
- Your insulin, with spares, all in the cabin
- Your cooling wallet, soaked and ready
- Meter, strips and something to treat a low
- Your prescription
- Pump or sensor spares, if you use them
At your destination, cold tap water is enough to recharge the Dia-Cool, so there's nothing to hunt for when you land.
FAQ
1) How long does a Dia-Cool keep insulin cool?
48 hours or more, depending on the outside temperature. When it stops cooling, soak the insert in cold water again.
2) Can I put the Dia-Cool in the fridge or freezer to recharge it?
No. Cold tap water is all it needs. Fridge and freezer can damage the pearls.
3) Is a Dia-Cool a replacement for a fridge?
No. It helps keep insulin at a sensible temperature in the heat. For a medicine that must stay close to 0°C, follow its own storage instructions.
4) Can I bring a Dia-Cool in my carry-on bag?
Yes, it goes in your cabin bag without any problem. Check your airline's and airport's guidance before you travel, as rules can differ.
5) How long can insulin stay out of the fridge?
It depends on the brand and on the temperature, so your leaflet is the only reliable answer. Insulin in use is normally kept at room temperature, away from heat and direct sun.
Conclusion
You don't need a fridge to keep insulin cool on the road. Soak the insert, wipe it, pack it, and keep your insulin with you in the cabin. Add a quick look at your leaflet for the temperature limits, and you're set for most trips.
