Warm berries overload the shipper
Strawberries should enter the package already chilled. Packing warm fruit leads to fast condensation and a short holding time.
Strawberries Cold Chain
Cold Chain Packout for Pre-Cooled Strawberries in Clamshells
Strawberries need a cold route, but the packout cannot rely on heavy frozen packs alone. The goal is to start with pre-cooled fruit, hold a stable chilled range, protect clamshells from pressure, and keep the pack dry enough for retail acceptance.
0-4 CCommon chilled target after validation
90-95%High humidity need without wet packaging
12-36 hCommon local and overnight delivery window
No freezeAvoid direct contact with hard frozen packs
Product Risk
Why this product needs its own packout logic
The right package has to protect the product’s arrival quality, not only keep the logger cold. The risk points below determine the insulation choice, coolant placement, pre-cooling requirement, and receiving checks.
Soft fruit shows damage late
Small impacts or top-load pressure can appear as dark marks after delivery.
Leak and condensation trigger rejection
Wet pads, wet labels, or sweating clamshells can make a cold shipment look poorly handled.
Blocked vents trap heat and moisture
Gel packs and dividers should not seal clamshell vents or create a cold wet surface against fruit.
Route-Based Recommendation
Choose the packout by product condition, ambient heat, and delivery time
These are practical starting points for sample planning. Final coolant weight and insulation thickness should be verified with the actual payload, shipper, route, and receiving standard.
| Shipment condition | Recommended Tempk package | Starting coolant direction | Coolant position | What to validate |
|---|---|---|---|---|
| Same-day local delivery 8-18h route, ambient below 22 C, short dock exposure |
Insulated carton liner or compact EPS shipper, vented clamshells, absorbent pad, and rigid outer carton | About 0.4-0.8 kg total conditioned gel packs for a 1-3 kg chilled payload. Use the calculator for actual payload, box size, and ambient profile. | Side-wall gel pack or top-corner placement with corrugated divider; keep coolant off the clamshell lid. | Arrival fruit temperature, clamshell dryness, berry firmness, leak marks, and remaining coolant state |
| Overnight parcel route 18-36h route, ambient 22-30 C, depot and van handling |
EPP or EPS insulated box, liner bag, absorbent layer, fixed clamshell stack, and stronger outer carton | About 0.8-1.5 kg total gel packs or chilled PCM for a small parcel. Increase only after checking cold-spot risk. | Two side positions or side-plus-top with a buffer layer; place logger near the product center or warm side. | Warmest payload point, cold spots near coolant, condensation, clamshell pressure, and berry bruising |
| Hot-weather or delay-prone route 30-35 C ambient, 36-48h risk, weekend hold possible |
Thicker EPP/EPS shipper, higher insulation margin, moisture barrier, and route logger | About 1.5-2.5 kg total coolant or a chilled PCM system for a small parcel. Hard frozen bricks need full product buffering. | Perimeter coolant layout with dividers on all product-facing sides; keep weight away from the top of the stack. | Peak temperature, freeze contact risk, pad wetness, carton strength, and receiving appearance |
Coolant mass is a starting point, not a guarantee. Adjust by product temperature at packing, payload weight, clamshell or carton count, shipper size, insulation material, coolant conditioning, route duration, ambient profile, and receiving checks. More ice can create cold spots, moisture, or pressure damage when the product support is wrong.
Ice Pack CalculatorEstimate a starting coolant mass from payload, box size, route time, and ambient temperature.
Coolant & PCM ReferenceCompare gel ice packs, PCM, ice bricks, and conditioning behavior before testing.
Route Risk CheckerCheck whether the route needs more insulation, coolant margin, or a shorter shipping window.
Cold Chain ToolsOpen the full Tempk tool set for package, coolant, route, and material planning.
Packout Structure
Build the box from the product outward
For produce, inner pack control is just as important as insulation. Start with the product condition and pack format, then add coolant and insulation around it.
Recommended layer order
1. Pre-cooled fruitPack only after strawberries and clamshells reach the agreed chilled condition.
2. Vented clamshellUse clamshells that support the fruit without blocking airflow or crushing top berries.
3. Absorbent padPlace absorbent material where light condensation or berry moisture is likely to collect.
4. Product spacerReduce stack movement and separate clamshells from coolant pressure.
5. Coolant pocketKeep gel packs on side walls or buffered top corners, not directly against fruit.
6. Insulated shipperSelect EPS, EPP, or an insulated carton by route time, ambient range, and payload mass.
Packing Process
Prepare the product before the coolant has to work
A stronger shipper helps, but product temperature, pack stability, and coolant separation usually decide whether the delivery is accepted.
1
Chill product and packaging first
Pre-cool strawberries, clamshells, pads, and inner packaging so the box is not fighting avoidable heat load.
2
Condition coolant for the lane
Choose gel packs or PCM by route target. Avoid hard frozen contact unless a divider has been tested.
3
Pack tight but not compressed
Fill empty space, keep clamshells level, and prevent gel packs from pressing into the fruit stack.
4
Inspect the received pack
Check temperature, firmness, bruising, leak, pad wetness, clamshell condition, and carton strength.
When to Change the Design
Arrival signals that point to the next adjustment
If berries arrive cold but wet
Keep the thermal target, then improve absorbent material, liner design, vent clearance, or coolant conditioning.
If berries bruise or leak
Reduce stack pressure, add dividers, limit headspace, and keep coolant weight off clamshells.
If the product warms too early
Increase insulation margin, use a larger shipper-to-payload ratio, adjust coolant mass, or shorten the shipping window.
Related Resources
Use these pages when finalizing the sample request
Fruits & Vegetables Cold Chain SolutionsReturn to the category route and compare produce products.Blueberries Cold Chain SolutionCompare a smaller berry with bloom and venting concerns.Avocados Cold Chain SolutionCompare ripeness-sensitive produce routes.
Gel Ice PackReview coolant options for chilled fresh produce lanes.
EPP Insulated BoxUse for reusable or higher-protection produce routes.
Insulation Carton BoxUse for lighter parcel programs and lower-weight fresh produce shipments.
Insulation Material ReferenceCompare insulation options before route testing.
Contact TempkSend route time, product condition, payload count, and package size for packout support.
Need this packout tested for your route?
Share berry temperature at packing, clamshell size, payload weight, route duration, ambient range, and receiving checks. Tempk can help choose insulation, gel pack layout, and validation steps.
Request a packout review