The master box is the outer, structural layer of the shisha charcoal packaging system: it takes the stacking load in the container and the warehouse, so its construction — not the retail print — decides whether cartons arrive square.
Quick answer
What is a coconut charcoal master box?
A master box is the corrugated kraft outer carton that carries coconut shisha charcoal through container freight and warehouse stacking. Ours holds 10 kg or 20 kg of charcoal net, in single- or double-wall board, plain or printed with your brand. Every export carton carries the UN 1361 / Class 4.2 dangerous-goods marking, country of origin and a lot code, branded or neutral.
Master box at a glance
- Material
- corrugated kraft board
- Wall types
- single- or double-wall
- Net charcoal per box
- 10 kg or 20 kg
- Holds (representative)
- a 20 kg master box corresponds to 20 × 1 kg or 40 × 500 g inner boxes
- Printing
- Plain kraft or printed with your brand
- Palletization
- Optional — ISPM-15 heat-treated pallets
- 20ft container payload
- 18,500–19,750 kg net with full packaging, by shape; 19,500–20,000 kg in 20 kg master boxes
- Markings
- UN 1361 / Class 4.2 DG, origin, lot; net weight on request
- Branding
- Neutral and white-label both available
- Double-wall upgrade
- Available on request
- Strapping
- Available on request
1. Construction: single vs double wall
Ours is corrugated kraft board, produced in single- or double-wall variants.
Carton strength is specified by edge-crush test (ECT) rating, burst strength, flute profile, and corrugate weight; these decide how high cartons stack safely during 15–60 days at sea. The exact strength specification for your order's box size is confirmed with the quote.
- Closed branded coconut charcoal master box, three-quarter view
Printed master carton, ready for container loading. - Open coconut charcoal master carton showing packed inner boxes
The master box carries the stacking load; inner boxes carry the brand.
Single vs double wall
Single-wall corrugate is the standard for palletized loads and shorter routes; double-wall adds a second fluted layer for floor-stuffed containers, humid-season shipments, and high stacks — a heavier box that holds its edges under compression.
The double-wall upgrade is priced per ton as a white-label / custom-print add-on.
- Single-wall versus double-wall corrugated cross-section comparison
Double wall adds a second fluted layer for stacking strength.
2. Dimensions & weights
Net weight options per master box: 10 kg or 20 kg of charcoal. Net weight counts the charcoal only; gross weight (charcoal plus packaging) is what freight calculations use, and is confirmed per configuration with the quote.
By net weight, a 20 kg master box corresponds to 20 × 1 kg or 40 × 500 g inner boxes. Exact inner-box counts vary with the inner-box size and briquette shape, and are confirmed per size with your quote.
- Coconut charcoal master box with measuring tape for scale
Outer dimensions are confirmed per box size with the quote.
3. Printing & branding on the master box
Master boxes ship plain kraft (neutral) or printed with your brand. Brown kraft mutes vivid colors, so how full-color artwork prints and which faces print are specified per design with the quote.
Or apply printed box labels as a lower-cost, fast-turnaround branding alternative to direct carton printing. Printed box labels
Artwork: print-ready vector files (AI / PDF), CMYK. Full white-label & artwork specs
- Full-color print detail on a coconut charcoal master carton
Full-color carton print; vivid color on kraft uses a white-top liner.
4. Loading: strapping, pallets and the 20ft container
Strapping & palletization
Cartons load two ways: floor-stuffed (maximum payload, manual unloading) or palletized on ISPM-15 heat-treated wood pallets for forklift handling. A 20ft on wooden pallets loads only 15–16 tons and is not recommended; palletized loads ship in a 40ft. Load-securing add-ons such as strapping and edge protectors are specified per order.
All load-securing add-ons Container loading rules
- PP-strapped coconut charcoal master carton, strapping detail
Strapping detail on a master carton. - Shrink-wrapped pallet of coconut charcoal master cartons
Palletized loading on ISPM-15 heat-treated pallets.
A 20ft container's net payload depends on the briquette shape: 18,500 kg for hexagonal, finger (stix), flat, cube 22 mm, and 19,750 kg for cube 25, 26, 27, 28 mm, with full packaging in 10 kg master boxes. Packed in 20 kg master boxes, a 20ft carries 19,500–20,000 kg net. A 20ft on wooden pallets loads only 15–16 tons and is not recommended; palletized loads ship in a 40ft.
| Shape family | Full packaging, kg net | 10 kg master boxes | Bulk packaging, kg net |
|---|---|---|---|
| hexagonal, finger (stix), flat, cube 22 mm | 18,500 | 1,850 | 19,500 |
| cube 25, 26, 27, 28 mm | 19,750 | 1,975 | 20,000 |
Container-count FAQ on the packaging hub
- Floor-stuffed 20ft container stacked with coconut charcoal master boxes
Floor-stuffed 20ft container of master boxes.
5. Compliance & markings
Every export master box — neutral or branded — is printed with the UN 1361 marking and Class 4.2 dangerous-goods labels (IMDG Code UN 1361 Class 4.2 (spontaneous combustion)), country of origin (Made in Indonesia) and a batch/lot code. Net weight is printed on request. Carriers check these markings before accepting the booking; missing marks strand cargo at the port.
UN Transport of Dangerous Goods (UNECE) (opens in new tab) UN 1361 shipping rules Export documents
- UN 1361 dangerous goods and origin markings printed on a charcoal master carton
DG, origin and lot markings on every export carton.
6. Neutral vs branded master box
The neutral master box is plain kraft with compliance markings only — no printing surcharge, fastest turnaround. The branded box carries your artwork; custom sizes are quoted per design. If your boxes need to match retail inner boxes, brand both layers in one white-label run.
Want to check the carton quality before ordering? Request a sample master box through the proof and sample flow.
White-label & artwork specs Request via inquiry Request samples
- Neutral plain kraft coconut charcoal master box
Neutral carton: plain kraft, compliance markings only.
7. A View from the Other Side: Isn't a Neutral, Unbranded Carton a False Economy?
Note
The hardest counter from an experienced importer runs like this: a plain kraft carton is a false economy. Retail buyers and distributors judge a brand partly by how its master cartons present on the warehouse floor, and a brown, label-only box reads as a no-name commodity that weakens shelf and re-order pull. Worse, a vendor who cannot publish an ECT rating, burst figure, or outer dimension is asking you to trust that the box is strong enough — on a Class 4.2 spontaneous-combustion cargo that sits 15–60 days at sea. "Confirmed with the quote" is not a spec.
Part of this holds. The presentation point is fair for buyers selling into branded retail channels, where the master carton is part of how the brand shows up at the distributor. And the spec-transparency point is fair on its face: at present this page publishes no carton-strength number, because those fields are not yet filled in our source data. A buyer who needs the ECT figure to satisfy their own insurer or carrier is right to ask for it before booking, not after.
Note
But neutral is neither unprotected nor unmarked. The protective layer is the carton's construction — corrugated kraft, single- or double-wall — which is identical whether the box is printed or plain; branding is print on the outside and changes nothing structural. And a neutral carton is not blank: every export box, neutral or branded alike, still carries the UN 1361 / Class 4.2 dangerous-goods marking, the country of origin and a lot code, all of which carriers verify before accepting the booking. The compliance floor is the same. Because branding is decoupled from configuration, neutral versus branded is a free choice rather than a quality tier: a buyer who wants warehouse-floor presence brands the carton, while a buyer who wants the fastest, surcharge-free turnaround takes neutral — or applies printed box labels as a lower-cost branding step on a plain carton. None of these change how the box survives the container.
The transparency objection is answered by quoting, not hiding: strength is specified per box size and wall type and confirmed with the order, and a buyer can request the ECT, burst, and dimension figures before booking, then request a physical sample master box through the proof-and-sample flow to verify carton quality first-hand rather than on a published sheet. In short, the presentation argument is a reason some buyers choose branded — which this factory fully supports — not a reason neutral is inferior protection or inferior compliance.
Master-box FAQ
What is a master box (master carton)?
What is the master box made of, and how strong is it?
What master-box sizes and weights do you offer?
How many inner boxes does a master box hold?
Can the master box be printed with my brand?
Do you offer plain or neutral master boxes?
What markings are printed on the master box?
Can I order a custom master-box size, or request a sample?
Answered on another page: Are master boxes loaded loose or palletized? · Packaging hub FAQ · General FAQ
Sources
- Transport of dangerous goods (opens in new tab), United Nations Economic Commission for Europe (UNECE)