Single-Wall vs Double-Wall Long Boxes: Which Is Stronger?
Single vs double wall for long boxes: when to upgrade and when single wall is enough.
The difference
Quick answer
Single-wall for long boxes under 80cm with light contents (under 3kg). Double-wall for everything else. Long boxes amplify the weakness of single-wall board because the unsupported span creates leverage. A single-wall box that performs fine at 50cm may fail at 120cm. When in doubt, upgrade to double-wall - the cost increase is typically 40-60% but prevents damage that costs far more.
When single wall works
At shorter lengths, single-wall B or C flute provides adequate span rigidity.
When contents are light, centre-span stress is minimal.
Rigid items like metal tubes or wooden poles support themselves.
When double wall is needed
Upgrade to double wall when0 / 4 checked
Board specifics: board grades or reinforcement techniques.
Cost comparison
Double-wall costs 40-60% more per unit than single-wall. It also weighs more, slightly increasing shipping costs. However, for boxes over 80cm, the damage prevention value of double-wall almost always exceeds the cost premium. A £1 box upgrade prevents damage claims costing £15-50+.
Single and double wall long boxes
Both constructions available from ProcuraPack in custom sizes.
Browse long boxesFrequently asked questions
Over 80cm long, over 3kg contents, fragile items, or stacking/palletised applications.
Yes, for short (under 80cm), light (under 3kg), self-supporting items.
Roughly double the compression strength and span rigidity of single wall.
40-60% more per unit, but prevents damage costing far more.
Yes, use single wall for shorter boxes and double wall for longer ones.
Part of our guide
Product Guide: Long Cardboard Boxes
Expert guides on long cardboard boxes for shipping oversized, elongated, and awkward items safely.
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