I use a FRIO cooling wallet to protect my prescription eye drops on trips to hot countries. It doesn't turn into a mini fridge though, and knowing exactly what it does, and doesn't do, actually matters if you're on drops that specifically say not to refrigerate them. Here's what I found out, and how I actually use mine.
I first started using a FRIO wallet before a month-long trip to Southeast Asia, temperatures pushing past 30 degrees most days, and I was on Vevizye, a multi-dose bottle I needed to keep with me the whole time. I didn't want to just leave it sitting in a hot bag all day, but I also didn't want to give anyone bad advice by assuming "cooling wallet" automatically means "keeps things cold". So before writing this, I actually checked the details properly rather than just repeating what I assumed.
A FRIO works through evaporation, not refrigeration. The inner wallet has crystals that turn into a cooling gel when you soak it in water, and as that moisture slowly evaporates it draws heat away from whatever's inside. It keeps contents within roughly 18 to 26 degrees for at least 45 hours, even in proper heat. What it does not do is chill anything down to fridge temperature. It stops things overheating, it doesn't cool them down. That distinction turned out to matter a lot once I looked at what my own drops actually needed.
Both Vevizye and iKervis come with the same instruction on the leaflet: do not freeze or refrigerate, store below 25 degrees. That's exactly the range a FRIO wallet holds things in, which is what makes it a genuinely good match for these, rather than just a nice-to-have gadget. If you're travelling with Vevizye to a hot climate, or heading somewhere hot on iKervis, keeping the bottle below 25 degrees is a real, practical thing to think about, not something you can just leave to chance in a hot bag or a car boot.
Where I want to be careful is autologous serum drops. Those need to stay at true fridge temperature day to day, around 2 to 8 degrees, and a FRIO wallet simply doesn't get that cold. It'll stop them overheating, but it will not properly refrigerate them. So if you're on serum drops, please don't take this as a green light to swap out your fridge for a cooling wallet, that's a different situation, and your clinic will already have given you the right storage instructions for it.
Something I actually wondered myself: does an unopened bottle need the same treatment, or is it only the one you've started using? For Vevizye at least, the storage rule is the same whether the bottle is open or still sealed, below 25 degrees, never frozen or refrigerated. So if you're travelling longer than one bottle lasts (Vevizye is good for about four weeks once opened) and you're carrying spares, those spare unopened bottles need protecting too. That's exactly why I keep a larger wallet for longer trips, so I can fit a few bottles in alongside the one I'm actually using.
Honestly, it worked, and it was far less faff than I expected. I thought keeping up with reactivating it would be annoying, but it's officially every 45 hours, so roughly every two days, and in practice it's just a couple of minutes soaking it in whatever water you can find. It doesn't need to be fridge-cold tap water either, a shop-bought bottle of water or the fridge in your accommodation is fine. I never once struggled to find water to do it, even travelling around. For long flights I just reactivate it before I leave, and I'm covered for the 45 hours regardless of what happens in transit.
Bulk wasn't an issue either. They do a wallet sized specifically for eye drops, so it's small enough that it just lives in my bag without getting in the way.
For most people, going away for a couple of weeks somewhere hot with one opened bottle, the small individual or eye-drop-sized wallet is genuinely all you need. It's for trips like mine, a month or more, where you're also carrying spare unopened bottles, that the larger wallet earns its keep, since it fits several bottles in at once rather than just the one. I'll be using mine again for future trips back to Laos.
You can buy directly from the FRIO website, or on Amazon UK, which stocks a few different sizes including one made specifically for eye drops.
This isn't something everyone with dry eye needs. If you're on drops that don't care about heat, or you're not going anywhere particularly hot, you can skip it entirely. But if you're on a drop like Vevizye or iKervis and you're heading somewhere properly hot for any length of time, it's a genuinely low-effort way to stop worrying about it, a couple of minutes every two days, and you can stop thinking about whether your bottle's cooking in your bag.
Do eye drops need to be kept cool when travelling?
It depends on the drop. Some, like autologous serum drops, need proper refrigeration. Others, like Vevizye and iKervis, specifically say not to refrigerate them, they just need to stay below 25 degrees. In hot climates that second group is where you can actually run into trouble, because a bag left in the sun on a hot day can easily go above that.
What temperature does a FRIO cooling wallet actually keep things at?
It keeps contents between roughly 18 and 26 degrees for at least 45 hours, even in serious heat. It works through evaporation rather than refrigeration, so it stops things overheating, it does not chill them down to fridge temperature (2 to 8 degrees). That distinction matters a lot depending on which drops you're on.
Can you refrigerate Vevizye or iKervis eye drops?
No. Both leaflets are clear: do not freeze or refrigerate, store below 25 degrees. That's exactly the range a FRIO wallet keeps things in, which is what makes it a genuinely good match for these two, rather than just a nice-to-have.
Can you travel with Vevizye to a hot climate?
Yes, but it's worth planning for. Vevizye must stay below 25 degrees and never be frozen or refrigerated, so travelling with Vevizye somewhere genuinely hot means keeping the bottle out of direct sun and hot bags, a cooling wallet like FRIO is an easy way to do that without over-cooling it into fridge territory, which you're not supposed to do anyway.
Is a FRIO wallet cold enough for autologous serum eye drops?
No, and this is the bit I didn't want to get wrong. Serum drops in daily use need to be kept at true fridge temperature, around 2 to 8 degrees. A FRIO wallet only gets down to about 18 degrees, so it will stop them overheating but it will not keep them properly refrigerated. Don't rely on one for serum drops, follow whatever your clinic has already told you.
How often do you need to reactivate a FRIO wallet?
Officially every 45 hours, so roughly every two days, sooner if you're somewhere extremely hot. The first soak takes longer (five to twelve minutes depending on the size), but topping it back up after that only takes a minute or two in whatever water you can find, it doesn't need to be fridge-cold water.
Do unopened eye drop bottles need to be kept cool too?
Yes, for drops like Vevizye the storage rule (below 25 degrees, not frozen or refrigerated) applies whether the bottle is open or still sealed. So if you're travelling longer than one bottle lasts and carrying spares, they need the same protection as the one you're using.
What size FRIO wallet do you need for eye drops?
For most people on a normal holiday of a couple of weeks with one opened bottle, the small individual or eye-drop-sized wallet is plenty. If you're away for longer, a month or more, and carrying spare unopened bottles as well, a larger wallet that fits a few bottles in is worth having.
Where can you buy a FRIO wallet?
Directly from the FRIO website, or on Amazon UK, which stocks several sizes including one made specifically for eye drops.
More of my journey: Flying with dry eye → · My Vevizye experience → · My iKervis experience →