Single Wall vs Double Wall Boxes: Which to Use
Single Wall vs Double Wall Boxes: Which to Use
Use a single wall box for most everyday ecommerce and shipping loads—light to moderate weight, items that are not especially fragile, and parcels that will not be stacked under heavy pallet loads. Step up to a double wall box when the contents are heavy, fragile, or dense, when the box will be stacked or stored under load, or when a shipment sees rough handling. Single wall uses one corrugated layer between two liners; double wall uses two corrugated layers between three liners, which adds stacking strength and puncture resistance. Packrift carries both, so once you know the weight and fragility of what you are shipping you can route straight to the right grade.
Single wall vs double wall at a glance
Figures below are typical industry ranges, not guarantees—always confirm the rating printed on the specific box you buy.
| Factor | Single wall | Double wall |
|---|---|---|
| Construction | One fluted layer between two liners | Two fluted layers between three liners |
| Typical ECT / burst | Often rated around 32 ECT (about 200# burst) for standard grades, up to about 44 ECT (about 275# burst) for heavy-duty single wall | Often rated from about 48 ECT (about 275# burst) up to roughly 71 ECT for heavy grades |
| Weight capacity guidance | Standard 32 ECT is often used up to about 65 lb; heavy-duty single wall around 44 ECT is often used up to roughly 95 lb | Entry double wall around 48 ECT is often used up to about 100 lb, with heavier grades used for loads well beyond that |
| Best uses | Everyday ecommerce parcels, apparel, books, light to moderate goods, single-layer or light stacking | Heavy or dense products, fragile items, industrial parts, stacked storage, long or rough transit |
| Cost consideration | Lighter board and lower cost per box; the economical default for most shipments | More board and higher cost per box; worth it when protection or stacking strength is the priority |
How to choose by weight and fragility
Start with the packed weight of the item, then adjust for fragility and handling.
- Light to moderate, not fragile. For everyday parcels in the light-to-moderate range that will not be heavily stacked, a standard single wall box (often around 32 ECT) is usually enough.
- Heavier but still single wall. As the packed weight climbs toward the top of the single wall range, move to a heavy-duty single wall grade (often around 44 ECT) before jumping to double wall.
- Heavy, dense, or fragile. For heavy or dense contents, fragile items, or anything that needs to survive stacking and rough handling, choose double wall (often 48 ECT and up) for the extra stacking strength and puncture resistance.
- Stacked or stored under load. If boxes will be palletized or stored stacked, weight the decision toward the higher grade, because ECT reflects top-to-bottom compression strength.
- When in doubt, size up the grade. The cost gap between grades is small next to the cost of a crushed or punctured shipment, so err toward more board for valuable or fragile loads.
Shop the right box grade
Once you know the grade you need, go straight to the matching Packrift category.
- Corrugated boxes in single wall and double wall grades for shipping and storage — Shop corrugated boxes.
- Mailer boxes for retail-ready and ecommerce parcels — Shop mailer boxes.
- Void fill and kraft paper to cushion contents and stop shifting inside the box — Shop void fill or shop kraft paper.
- Carton sealing tape and stretch film to close cases and secure pallets — Shop carton sealing tape or shop stretch film.
Request a bulk quote
Buying boxes in one grade at volume, or mixing single wall and double wall across sizes? Send the SKUs and quantities and get pricing back for your order. Request a bulk quote.
Related pages
Comparing packaging suppliers as well as box grades? See the best Uline alternatives for a broader comparison.
FAQ
What is the difference between single wall and double wall boxes?
A single wall box has one corrugated layer between two liners; a double wall box has two corrugated layers between three liners. The extra layer gives double wall more stacking strength and puncture resistance for heavy or fragile loads.
When should I use a single wall box?
Use single wall for most everyday ecommerce and shipping: light to moderate weight, items that are not especially fragile, and parcels that will not sit under heavy stacked loads. Standard single wall is often rated around 32 ECT.
When should I use a double wall box?
Use double wall when the contents are heavy or dense, fragile, or when the box will be stacked, stored under load, or shipped over long or rough routes. Entry double wall is often rated around 48 ECT and up.
What does ECT mean on a box?
ECT is the Edge Crush Test, a measure of top-to-bottom compression strength—how much stacking pressure a box can take before it crushes. A higher ECT generally means more stacking strength.
How much weight can a single wall box hold?
It depends on the grade. Standard single wall around 32 ECT is often used up to about 65 lb, while heavy-duty single wall around 44 ECT is often used up to roughly 95 lb. Always confirm the rating on the specific box, since dimensions and handling affect real-world capacity.
How much weight can a double wall box hold?
Entry double wall around 48 ECT is often used up to about 100 lb, with heavier grades handling loads well beyond that. These are typical ranges; confirm the rating on the box you buy.
Is a double wall box worth the extra cost?
For heavy, dense, or fragile contents, or when boxes will be stacked and stored under load, the added stacking strength and puncture resistance usually justify the higher board cost. For light, non-fragile everyday parcels, single wall is the more economical choice.
Does Packrift carry both single wall and double wall boxes?
Yes. Packrift carries corrugated boxes in both single wall and double wall grades, plus mailer boxes, void fill, kraft paper, tape, and stretch film, so you can match the box grade to the load and finish the order in one place.