How to Pack a Cooler Bag So Food Stays Cold for Longer
How long a cooler bag keeps food cold depends as much on how you pack it as on the bag itself. These six steps help any insulated bag perform at its best.
1. Pre-chill everything
Put food and drinks in the fridge overnight. Warm items added to a cooler use up its cold quickly. If you have space, put the empty cooler bag in a cool room or briefly in the fridge too.
2. Freeze what you can
Frozen water bottles, frozen juice boxes and even frozen marinated meat act as extra ice packs and thaw by the time you need them.
3. Pack in layers
- Bottom: ice packs and the items that need to stay coldest, like raw meat (sealed) and dairy.
- Middle: sandwiches, salads and prepared food.
- Top: fruit, snacks and the things you'll reach for first.
Cold air sinks, so placing an ice pack on top as well helps the whole bag stay cold.
4. Fill the gaps
Air warms up faster than packed food. Fill empty space with extra ice packs, a frozen bottle or a folded towel. This is why an expandable cooler is useful: collapse it for small loads and expand it for big days, so there is never too much empty space.
5. Keep it closed and shaded
- Open it only when you need to.
- Keep it out of direct sun, and never leave it in a hot car boot for long.
- Use a separate bag for drinks so the food bag stays shut.
6. Keep raw and ready-to-eat apart
Seal raw meat in containers or double bags and keep it at the bottom, so juices can't drip onto other food.
The hot side
Insulation works both ways. Heat the pack in warm water and you can keep food warm for a short trip, but never mix hot and cold food in the same bag.
Cleaning
Wipe the inside with warm soapy water after each use, and leave it open to dry fully so it stays fresh.
Our expandable cooler bag grows from 6.15 to 11.88 litres and includes a hot/cold pack.
