Dimensions / Industrial & logistics / Corrugated boxes / Triple wall
A triple-wall corrugated box has four flat facings and three corrugated mediums (NMFC Item 222-6), a 7-ply board (Smurfit Westrock). Rule 41 grades it by a puncture test, not a burst test: the common 1100 grade, or 90 ECT, may carry 280 lb of box and contents at up to 120 in of outside length + width + depth, and the four triple-wall grades run from 700 or 67 ECT (240 lb, 110 in) to 1300 or 112 ECT (300 lb, 125 in). Uline’s 1,100 lb. board is over 1/2" thick. Sellers rate boxes of the same 1100 board from 280 lb (Box USA) to 1,500 lbs (Uline), so ask what the figure means. Pallet-sized triple-wall bins with a lid are Gaylord boxes.
| Box and contents, max, 1100 or 90 ECT | Outside length + width + depth, max | 1,100 lb. board, thicker than |
|---|---|---|
| 280lb127.0 kg | 120in3,048 mm | 1/2inUline |
Sources: Rule 41, Uline (1,100 lb boxes). Checked October 2026.
Box USA’s 40 × 30 × 30 in triple-wall box, measured outside, and the 1100 or 90 ECT limits are filled in. Enter your gross weight; each check uses the numbers in the tables on this page.
Sizes in millimetres, weights in kilograms, the box measured outside (1 in = 25.4 mm, 1 lb = 0.4536 kg). Boxes stand upright, in straight columns.
1041 + 787 + 762 = 2590 mm, within 3048 mm, and 120 kg is within the 127 kg limit of this grade.
Filled in: Rule 41’s 1100 or 90 ECT row, 280 lb (127.0 kg) and 120 in (3,048 mm), and Box USA’s 40 × 30 × 30 in box, 41 × 31 × 30 in outside.
Boxes of 1041 × 787 mm fit 1 per layer on the 1219 × 1016 mm deck without overhang, and 762 mm boxes go 2 high under 1778 mm with the 141 mm pallet: 2 a pallet, enough for 2.
A 41 × 31 in box goes one to a layer on a 48 × 40 in pallet; Uline lists its 48 × 40 × 36 in triple-wall box by outside size, 46 3/4 x 38 3/4 x 36 in inside.
Loose and upright, the boxes go 14 per layer and 3 high in 2393 mm: 42, enough for your 40, and 4800 kg is within the 28380 kg payload.
Box USA rates this box at 280 lb, the Rule 41 figure; Uline rates its 1,100# boxes at 1,050 to 1,500 lbs. Enter the figure your box maker prints.
Replacing a wooden crate with a triple-wall box? Photograph the packed box, mark its outside size, board and weight in SizeMarker and send it with the packing list.
Mark a photoTriple wall is graded by a puncture test, in inch-ounces per inch of tear, or by ECT; size is the outside length, width and depth added. Metric in grey is our conversion.
| Grade | Box and contents, max | L + W + D, max |
|---|---|---|
| 700 puncture or 67 ECT | 240 lb108.9 kg | 110 in2,794 mm |
| 900 puncture or 80 ECT | 260 lb117.9 kg | 115 in2,921 mm |
| 1100 puncture or 90 ECTThe common grade | 280 lb127.0 kg | 120 in3,048 mm |
| 1300 puncture or 112 ECT | 300 lb136.1 kg | 125 in3,175 mm |
Sources: Rule 41
| Item | What the source says |
|---|---|
| BuildNMFC Item 222-6 | Four flat facings and three intermediate corrugated mediums |
| PliesSmurfit Westrock | 7-ply: three layers of fluting between four layers of liner board |
| Grade testRule 41; NMFC Item 222-6 | Puncture test, inch-ounces per inch of tear, on the Beach puncture tester |
| Thickness, 1,100 lb.Uline; Box USA | Over 1/2" thick; Box USA: 1/2 in wall thick |
| Manufacturer’s jointRule 41, Section 5 | Lapped not less than two inches and stapled not more than one inch apart, or lapped three inches and glued |
| Instead of woodSmurfit Westrock; Uline | An efficient alternative to timber, plastic or metal packaging; the strength of a plywood crate at the cost of corrugated |
| When it is usedTIS (GDV) | Severe climatic conditions and mechanical stresses, and heavier cargoes |
| Typical loadsUline | Small motors, compressors or valves |
Sources: NMFC Item 222 · Smurfit Westrock · Rule 41 · Uline (1,100 lb boxes) · Box USA (55VJ64) · TIS (GDV)
Inside length × width × depth unless marked outside. All from distributors’ listings; the load figure is each seller’s own.
| Box | Size | Grade; seller’s load; weight |
|---|---|---|
| Uline S-13331 | 24 x 24 x 24 in | 1,100# TW; 1,050 lbs; 13 lbs |
| Uline S-11301 | 30 x 30 x 30 in | 1,100# TW; 1,100 lbs; 21 lbs |
| Uline S-16338Listed as 48 x 40 x 36 in | Inside 46 3/4 x 38 3/4 x 36 in | 90 ECT equivalent; 1,500 lbs; 40 lbs |
| Global Industrial WB423012 | 30 x 30 x 30 in | 1100# TW/ECT-90 |
| Box USA 55VJ64 | 40 x 30 x 30 inOutside 41 x 31 x 30 in | 90 ECT, CAA flute; 280 lb maximum load |
| Box USA 55VJ65 | 40 x 40 x 40 inOutside 41 x 41 x 40 in | 90 ECT; 280 lb maximum load |
| Box Partners | 12x12x12 to 48x40x36 in | ECT-90 |
Sources: Uline (S-13331) · Uline (S-11301) · Uline (S-16338) · Global Industrial (triple wall) · Box USA (55VJ64) · Box USA (55VJ65) · Box Partners
| Rule or figure | What it says |
|---|---|
| One-piece box or binUline | Triple Wall RSC: one-piece box, no separate lid; Triple Wall Gaylord: 275 lb. test lid included |
| Big boxes, inside or outsideUline S-16338 | The chart lists outside dimensions (not inside) |
| CHEP B4840A palletCHEP | 1219 × 1016 × 141 mm48 × 40 in |
| Box USA 55VJ64 outside, in mmOur conversion | 1041 × 787 × 762 mm |
| On that palletOur calculation | One a layer; 2 layers under 1,778 mm (70 in, FedEx Express Freight) |
| 20 ft insideTriton | 5,898 × 2,352 × 2,393 mm; 28,380 kg payload |
| 55VJ64 in that 20 ft, looseOur calculation | 14 a layer, 3 layers: 42 |
Sources: Uline (1,100 lb boxes) · Uline (S-16338) · CHEP (B4840A) · Box USA (55VJ64) · FedEx (How to Pack) · Triton (20ft)
A box of four flat facings and three corrugated mediums (NMFC Item 222-6); Smurfit Westrock calls it 7-ply construction. It is used for heavier cargoes and for severe climatic conditions and mechanical stresses (TIS).
Under rail Rule 41 the 1100 or 90 ECT grade allows 280 lb of box and contents at up to 120 in of outside length + width + depth, and 1300 or 112 ECT allows 300 lb and 125 in. Sellers print their own loads for 1100 board: Box USA 280 lb, Uline 1,050 to 1,500 lbs.
It is the puncture test of the board, in inch-ounces per inch of tear, not a burst test (Rule 41; NMFC Item 222-6). The ECT that goes with 1100 is 90; 112 ECT goes with 1300.
Uline’s 1,100 lb. triple wall is over 1/2" thick, and Box USA lists its 90 ECT box with a 1/2 in wall. So Box USA’s 40 x 30 x 30 in box measures 41 x 31 x 30 in outside.
Smurfit Westrock calls tri-wall an efficient alternative to timber, plastic or metal packaging, and Uline promises the strength of a plywood crate at the cost of corrugated; Rule 41 still caps the 1100 grade at 280 lb for carriage.
Not quite: Uline sells the same board as a Triple Wall RSC, a one-piece box with no separate lid, and as a Triple Wall Gaylord, a pallet-sized bin with a 275 lb. test lid included.
Buyers of machinery, auto parts and valves ask whether a triple-wall box can replace the wooden crate, which grade it is, what load the box maker rates it for, and whether it ships on a standard pallet. Mark the real box, its board and label on your own product photo in SizeMarker, as in the picture at the top, and send one product card for WhatsApp or WeChat.
