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How the formats compare
Below, EPS foam, waxed corrugated, and RENW Fiber Box are compared using our reference assumptions. Your route, product, and how you pack and handle boxes will determine what you see in a real trial — that’s what turns these figures into your numbers.
Total lifetime cost
Legacy
EPS foam
Standard
Waxed cardboard
The new standard
RENW Fiber Box
Freight & storage density
Legacy
EPS foam
(bulky)
Standard
Waxed cardboard
(*)
The new standard
RENW Fiber Box
(*)
Regulatory compliance
Legacy
EPS foam
Standard
Waxed cardboard
The new standard
RENW Fiber Box
Thermal integrity
Legacy
EPS foam
(~R-4.0)
Standard
Waxed cardboard
(~R-0.9)
The new standard
RENW Fiber Box
(~R-1.8)
| Performance metric | Legacy EPS foam | Standard Waxed cardboard | The new standard RENW Fiber Box |
|---|---|---|---|
| Total lifetime cost | close Typically higher | close Often higher | check Lower cost in our model |
| Freight & storage density | close 1:1 (bulky) | check_box >80% (*) | check_box ~66% to ~80%+ (*) |
| Regulatory compliance | close High risk | close Repulp risk | check Designed for paper stream** |
| Thermal integrity | check_box High (~R-4.0) | close Low (~R-0.9) | check_box Balanced (~R-1.8) |
*Freight savings vs EPS baseline. **Where accepted by local recovery streams.
Packout guidance: medium 5mm Fiber Box
10.5 L (11.1 qt) usable
US R-1.8 (AKD barrier)
Wet ice or commercial gel packs
100 kg load
No deformation in PDS; recommended working load: 25 kg
OD: 15.6" × 11.6" × 6.7"
395 × 295 × 170 mm
ID: 12.2" × 8.58" × 5.9" · 310 × 218 × 150 mm
Lid: 15.55" × 11.6" × 0.78" · 395 × 295 × 20 mm
Want a PDF to share with your team?
Download PDF one-pager downloadReference lane (proven)
Controlled reefer LTL (US foodservice)
This is the reference lane we’ve run in-market: controlled reefer LTL with a defined time-at-temp and excursion profile, coolant mass, usable volume, and payload band—see the matrix for the published reference row.
How to read the rest
Only the controlled reefer LTL row is in-market reference data. Every other scenario is indicative planning guidance only—gel, volume, and payload must be confirmed in your trial. Longer dwell, hotter ambients, or tougher handling usually require more coolant, coatings, or a different packout.
Product preview
Fiber Box rotating product shot
Reference values
Controlled reefer LTL
(US foodservice · in-market reference)
- Environmental load
- 24 hrs: 40F truck + 4 hrs of 80F excursion
- Gel packs required
- 2.6 lbs
(1.3 qt) - Max usable product volume
- 9.8 qt
- Max fish payload
- ~19.5 lbs
Indicative — confirm in trial
Ocean freight
(reefer container · starting point · confirm in trial)
- Environmental load
- 14-30 days: 34F container + port excursions
- Gel packs required
- 2.6 lbs
(1.3 qt · confirm in trial) - Max usable product volume
- 9.8 qt (confirm in trial)
- Max fish payload
- ~19.5 lbs (confirm in trial)
Indicative — confirm in trial
Air cargo
(IR-coated fiber, enhanced barrier · starting point · confirm in trial)
- Environmental load
- Short-haul air: moderate belly-hold conditions with reduced solar exposure vs. uncoated (indicative)
- Gel packs required
- Above reference
(lane-dependent · confirm in trial) - Max usable product volume
- Below reference (confirm in trial)
- Max fish payload
- Below reference (confirm in trial)
Indicative — confirm in trial
Air cargo
(standard uncoated fiber · higher-challenge · confirm in trial)
- Environmental load
- Short-haul air: moderate hold + higher ground-side thermal stress than IR-coated row (indicative)
- Gel packs required
- Above IR-coated air row
(lane-dependent · confirm in trial) - Max usable product volume
- Below IR-coated air row (confirm in trial)
- Max fish payload
- Below IR-coated air row (confirm in trial)
Indicative — confirm in trial
Non-reefer ambient
(UPS / FedEx Ground · highest-challenge · confirm in trial)
- Environmental load
- 24 hrs: uncontrolled 68F-75F ambient transit
- Gel packs required
- 6.0 lbs
(3.0 qt · confirm in trial) - Max usable product volume
- 8.1 qt (confirm in trial)
- Max fish payload
- Payload range TBD (confirm in trial)
| Shipping scenario (US market) | Environmental load | Gel packs required | Max usable product volume | Max fish payload | Next step |
|---|---|---|---|---|---|
| Reference values Controlled reefer LTL(US foodservice · in-market reference) | 24 hrs: 40F truck + 4 hrs of 80F excursion | 2.6 lbs (1.3 qt) | 9.8 qt | ~19.5 lbs | Discuss |
| Indicative — confirm in trial Ocean freight(reefer container · starting point · confirm in trial) | 14-30 days: 34F container + port excursions | 2.6 lbs (1.3 qt · confirm in trial) | 9.8 qt (confirm in trial) | ~19.5 lbs (confirm in trial) | Discuss |
| Indicative — confirm in trial Air cargo(IR-coated fiber, enhanced barrier · starting point · confirm in trial) | Short-haul air: moderate belly-hold conditions with reduced solar exposure vs. uncoated (indicative) | Above reference (lane-dependent · confirm in trial) | Below reference (confirm in trial) | Below reference (confirm in trial) | Discuss |
| Indicative — confirm in trial Air cargo(standard uncoated fiber · higher-challenge · confirm in trial) | Short-haul air: moderate hold + higher ground-side thermal stress than IR-coated row (indicative) | Above IR-coated air row (lane-dependent · confirm in trial) | Below IR-coated air row (confirm in trial) | Below IR-coated air row (confirm in trial) | Discuss |
| Indicative — confirm in trial Non-reefer ambient(UPS / FedEx Ground · highest-challenge · confirm in trial) | 24 hrs: uncontrolled 68F-75F ambient transit | 6.0 lbs (3.0 qt · confirm in trial) | 8.1 qt (confirm in trial) | Payload range TBD (confirm in trial) | Discuss |
Controlled reefer LTL is the only in-market reference lane in this matrix. Ocean freight, air cargo, and non-reefer ambient rows are not substitutes for validation—confirm coolant mass, usable volume, and payload in trial for your lane before relying on any numbers shown.
Performance & logistics
Logistic footprint
Fish size (model)
Large (>18 lb avg)
≈ 800,000 lb fish / mo (rough)
Truckloads · 0–1000 TL scale (fixed axis)
EPS foam
8.0 TL
1% of scale
Baseline
RENW Fiber
2.0 TL
0% of scale
~4:1 vs EPS (model)
Flat-pack
1.5 TL
0% of scale
Varies by format
Axis is fixed at 1000 TL max so all three bars grow as volume increases. Absolute TL is under each bar; % is share of the 1000 TL scale (capped at 100%). Horizontal bars use the same 1000 TL max scale: length shows truckloads; figures at right match the bar. % is share of the scale (capped at 100%).
Why shippers switch from waxed board
When waxed cardboard gets wet,
the economics fall apart.
Key checks
Same pairing as the table below: waxed risk, then Fiber Box advantage.
Wet handling
Waxed cardboard risk
Higher risk of wet-down and panel softening
Fiber Box advantage
AKD-sized wall system designed for wet handling workflows
Recovery stream
Waxed cardboard risk
Wax coatings can trigger repulping rejection
Fiber Box advantage
Better aligned to corrugated recovery behavior, with lane verification
Coolant fit
Waxed cardboard risk
Often becomes less reliable as moisture load and dwell time rise
Fiber Box advantage
Supports wet ice or commercial gel packs by lane
Moisture exposure
Waxed cardboard risk
Higher risk of wet-down and panel softening
Fiber Box advantage
AKD-sized wall system designed for wet handling workflows
Recovery pathway
Waxed cardboard risk
Wax coatings can trigger repulping rejection
Fiber Box advantage
Better aligned to corrugated recovery behavior, with lane verification
Coolant integration
Waxed cardboard risk
Often becomes less reliable as moisture load and dwell time rise
Fiber Box advantage
Supports wet ice or commercial gel packs by lane
Stack + handling cycle
Waxed cardboard risk
Greater variability under load, stacking, and saturation
Fiber Box advantage
Qualify with lane SOPs and crush/load safety margin
| What buyers care about | Waxed cardboard risk | Fiber Box advantage |
|---|---|---|
| Moisture exposure | Higher risk of wet-down and panel softening | AKD-sized wall system designed for wet handling workflows |
| Recovery pathway | Wax coatings can trigger repulping rejection | Better aligned to corrugated recovery behavior, with lane verification |
| Coolant integration | Often becomes less reliable as moisture load and dwell time rise | Supports wet ice or commercial gel packs by lane |
| Stack + handling cycle | Greater variability under load, stacking, and saturation | Qualify with lane SOPs and crush/load safety margin |
Ready to upgrade?
Upgrade your flimsy cardboard-only system—we’ll help you validate wet handling, payload, and recovery on your lane.
Validation checklist: dwell time, drainage, stack load, handling cycle, and destination recovery acceptance.
Thermal performance
Controlled meltwater test: Fiber Box loaded with 2 kg of ice to estimate system-level thermal resistance behavior (R-value proxy) under monitored ambient conditions.
Temperature profile
Controlled meltwater run · 5 min bins
Tap Expand for the full-width chart.
Industrial-grade thermal barrier
This chart comes from real temperature logs in a controlled meltwater test (2 kg ice load), plotted every 5 minutes. Treat it as a sanity check — your lane, payload, and packout are what determine the result in practice.
Innovation &
industrial design
Step 1 of 3
FSC wood & industrial hemp
Wood fiber and hemp-based pulp options tuned for strength and thermal performance, depending on what your product and lane actually need.
Bio-based fiber blends tuned for strength, thermal hold, and production repeatability.
Dig deeperCurbside paper stream
Designed to fit paper recovery where programs accept it. Local rules vary, so we help you confirm fit for your market.
Built to align with real mixed-paper recovery flows where local programs accept the format.
See end-of-life & EPRPrecision geometry
Precision wall geometry tuned for stack compression, handling, and nest pitch.
Ribbing, wall structure, and nest spacing calibrated for freight density and line handling.
Dig deeper
Seafood shipping:
Transgourmet reference
Transgourmet ran real-world seafood trials comparing Fiber Box to waxed corrugated. The point wasn’t a lab number — it was “does it hold up, stay cold, and survive handling” over the actual trip. Results still depend on the lane and how you pack out.
Need source context? See the PAPACKS/Transgourmet announcement. Read blog post
Who it's for:
industrial scale.
Built for high-throughput hubs where floor space is expensive and waste lines are audited — we’ll pressure-test nesting, pallet patterns, and freight with your network data.
Ready to
convert?
Swap out EPS and waxed corrugated without breaking operations. Get samples, run a trial in your lanes, and let’s review the results together.
Need another path?
If Fiber Box is not the fit, keep the conversation moving.
Many procurement and packaging teams need a bottle, tray, tube, or another molded-fiber format—not this shipper. Pick a path below to get to the right conversation faster.
Liquid + dry fill
See Fiber Bottle
For teams looking at paper-first bottle or hollow-body formats instead of seafood shippers.
Explore this route
Broader format search
Explore other products
Trays, cups, pods, inlays, and other molded-fiber options when a shipper is not the primary need.
View the lineup
Not sure yet
Tell us the lane
If the format is still unclear, give us the product, handling, and shipping reality and we can point you to the closest fit.
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