Double Wall Corrugated Boxes

Double Wall Corrugated Boxes for Heavy and Fragile Loads

Double wall corrugated boxes are the go-to when single wall simply cannot deliver enough crush, stacking or puncture resistance for the job. Their layered board protects heavier and higher-value goods through demanding supply chains, and understanding how the two fluted layers work together helps you specify the right grade so nothing arrives crushed, punctured or broken.

Two-Layer Construction and BC Flute

Double wall board glues two separate fluted mediums between three liners, creating two independent arch layers that absorb far more impact than a single medium ever could. The usual specification is BC flute, combining a taller C medium for cushioning and stacking height with a shorter B medium that adds density and a smoother surface for print. The two profiles also work at slightly different frequencies, so vibration and shock are damped more evenly across the wall. The result is a rigid, dependable carton that resists both compression from stacking and puncture from sharp contents or rough handling in transit.

Stacking Strength and ECT

Double wall grades typically start around 44 ECT and climb higher, which is exactly why they hold up under palletised column stacking, tall warehouse racking and long freight journeys. Because the Edge Crush Test correlates closely with a box's compression strength, specifying the right ECT is what prevents crushed cartons at the bottom of a stack after days in storage. We calculate the grade from your unit weight, the stacking pattern and how column or interlocked the load is, plus expected humidity, since moisture softens fibre and can strip a large share of a box's strength. That way the box performs right to the top of the pallet.

• 44 ECT and above available
• Column stacking on pallets
• Rated for long freight legs

Protection for Fragile Contents

Beyond stacking, the twin fluted layers cushion sudden shocks and dampen the constant vibration of road and sea transport, which is what protects glass, ceramics, electronics and precision machined parts. Vibration fatigue causes as much breakage as single hard impacts, so the extra board matters over long routes. Paired with fitted corrugated inserts, partitions or layer pads, double wall boxes immobilise contents completely so they survive drops, throws and rough handling that would defeat lighter board and loose fill. The combination of a strong outer wall and a snug internal fit is the most reliable way to move fragile stock through a busy distribution network without breakages.

Common Use Cases

These boxes suit heavy homeware, bottled and canned goods, automotive and industrial components, ceramics, appliances and any export order facing multiple handling points and customs checks. Businesses shipping internationally rely on double wall to meet ISTA transit testing protocols, which simulate the drops, vibration and compression of real distribution, and to reduce the costly in-transit damage claims that erode margin. Where single wall would need heavy extra void fill to cope, a correctly graded double wall box often does the job more cleanly and reliably.

Printing and Finishing on Heavier Board

A white top liner lifts CMYK graphics for retail-facing or premium double wall packaging, while kraft keeps an industrial, recyclable look for pure shipping duty. Flexo printing suits bold identification, handling marks and part numbers, and litho lamination handles detailed brand artwork on the heavier board. Die-cut hand holes make weighty cartons safer and easier to lift, and reinforced flaps or full-overlap bases can be added where the load is especially dense.

• White or kraft outer liner
• Flexo or litho-laminated print
• Die-cut hand holes for lifting

Sustainability and Wholesale Supply

Even at this strength, corrugated remains recyclable and is made largely from recovered fibre, so it is a far lighter and greener option than the timber or heavy plastic packaging it often replaces. Specifying double wall only where the load genuinely demands it avoids over-packaging and needless cost, and we help you confirm the grade with transit testing before you commit to a full production run.

Order double wall corrugated boxes wholesale from 100 units, with pricing that improves at volume, fast turnaround and a free 3D mockup on every job. Boxes ship flat and glued at the joint, storing compactly and assembling quickly for high-volume dispatch.