Cold Chain Guide: How to Pack with Foam Boxes & Polystyrene Eskies
Keeping cold or frozen goods fresh from your packing bench to your customer's doorstep doesn't have to be complicated. Whether you call them eskies, styro boxes, or polystyrene containers, these thick white foam boxes are the easiest way to trap the cold and keep outside heat out. They have tight-fitting lids that won't slip off and straight sides so they stack neatly inside delivery vans and trucks.
Stocked wholesale polystyrene esky boxes at our Villawood depotIf you are moving fresh seafood, meats, dairy, ready-made meals, or medical samples around Sydney, pairing these boxes with frozen ice gel packs or insulated box liners will drastically extend your safe shipping times.
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View all available sizes, internal dimensions, box quantities, and pickup details on our main store page.
Shop Polystyrene Boxes & Foam Eskies Here →Simple Tips for Packing Chilled Payloads
To get the longest cooling run times out of your foam containers, a few quick warehouse habits make a massive difference:
- Pre-chill your stock: Never pack warm or room-temperature products into a foam box. Cool them down in the fridge or freezer first so they don't instantly melt your ice packs.
- Pack ice at the top: Cold air travels downwards. Always place your frozen gel packs on top of or wrapped around your items, rather than just lining the bottom of the box.
- Fill the empty spaces: Big empty gaps are filled with air that will warm up your box quickly. Fill any headspace with crumpled packing paper, bubble wrap, or extra ice sheets to lock the cold in.
- Tape the lid seals: A tight lid is great, but running a single strip of wide packaging tape completely around the lid seam stops cold air from escaping during long truck trips.
Foam Boxes vs. Flat Foil Liners
If you are trying to figure out which cold chain option suits your warehouse packing benches best, here is how they stack up side-by-side:
| Handling Metric | Rigid Foam Boxes / Eskies | Foil Thermal Liners |
|---|---|---|
| Insulation Level | Excellent. Thick walls keep ice frozen over long regional courier routes. | Great. Perfect for quick next-day local metro deliveries. |
| Warehouse Space | Bulky. Arrive pre-made and must be stacked high on your floor. | Saves Space. Arrive flat in tight boxes until you need them. |
| Outer Packaging | Standalone. Ready to label and ship as they sit. | Requires an extra outer cardboard box to protect the foil bag. |
Want to save floor space and ship using flat bags? Check out our space-saving Thermal Liners here.
Request a Quote or Technical Guidance
Tell us what you are shipping and how long it needs to stay cold. We will recommend the right box size and ice configuration.