How to Pack a Medication Cooler
Freeze the packs flat for at least 12 hours, chill the empty cooler, and put a folded cloth between the frozen pack and the vials so they never touch it. Packed that way, an ice-pack cooler holds for 8–24 hours depending on the pack and the room; halve that for a hot day.
Last edited · written by PepPrep · not medical advice
A cooler fails in three ways: it was never cold to start with, the contents froze against the pack, or it was opened so often that it warmed anyway. Packing it properly is ten minutes the night before. This is the equipment side; the flying guide covers what security in each country expects.
The night before
- Freeze the packs flat for at least 12 hours; a pack that is "mostly frozen" lasts half as long. For an evaporative wallet, soak it for the time on the label and blot the outside dry.
- Chill the cooler itself: put the empty cooler in the fridge or drop a spare pack in it. Insulation only slows change; a warm cooler starts by warming your vials.
- Chill the vials: they go in straight from the fridge, never from the counter.
The layers, bottom to top
- Frozen pack, flat.
- A folded cloth or the cooler's divider. Vials in direct contact with a frozen pack can freeze, which is what the cloth is there to stop.
- Vials in their case or amber bag, standing up, with the logger or thermometer beside them.
- Second cloth, second pack if the cooler takes one.
- Syringes, pads and the travel sharps container on top or in the outer pocket: they do not need to be cold and they are what security wants to see first.
On the day
Open it as little as possible; every opening costs about an hour. Keep it out of direct sun and in the cabin, not the boot (trunk), which has no air conditioning and sits over the exhaust; the footwell behind the front seats is fine. If there is a fridge at the far end, transfer straight away and re-freeze the packs. Read the logger before you throw the packaging away; if it shows a warm spell, the temperature-loss calculator tells you what it cost.
How long does it actually last?
The product records give a figure for each cooler (8–24 hours for an ice-pack cooler depending on the pack and the ambient temperature, about 45 for an evaporative wallet, a day on battery for a powered one), measured in a room, not a hot car. Halve it for a hot day; double the packs for a long one. For anything over two days, the powered cooler comparison is the honest read.
Supplies mentioned: Travel · Travel checklist
Equipment only: nothing on this page is advice about what to inject, how much, or whether a product is fit to use. That comes from the product's labelling and whoever supplied it.