Dimensions / Industrial & logistics / FIBC bulk bags / U-panel
A U-panel bulk bag is one U-shaped piece of fabric forming two opposite sides and the bottom, with two side panels sewn in (Palmetto, BAG Corp). Stock U-panel bags in North America sit on a 35 × 35 in base and stand 35 to 72 in tall: Halsted rates its 35x35x40" to 35x35x55" bags at 3000lbs (1365kg) or 4000lbs (1820kg) at 5:1, and Uline’s 35 x 35 x 50" bag holds up to 3,000 lbs in 45 cu ft. In metric, Sackmaker’s 87 x 87 cm inner base (91 x 91 cm outside) makes 1.0 m³ at 130 cm tall. Filled, the sides bulge (US 10131470): that bag is 115 cm across, so although Langston says a 35 × 35 bag fits on most 40″ x 48″ pallets, check the filled size against FIBCA’s no-overhang rule.
| Base, stock US bags | Heights, Halsted and BAG Corp | SWL at 5:1, Halsted |
|---|---|---|
| 35 × 35in889 × 889 mm | 35–72in889–1,829 mm | 3000–4000lbs1365–1820 kg |
Sources: Halsted (BB-40UDS), Halsted (BB-55CDS4K). Checked October 2026.
Sackmaker’s standard 1.0 m³ bag, measured filled, is entered with Transoplast’s 1200 × 1200 mm pallet and Triton’s 20 ft. Enter your bulk density; each check uses the numbers in the tables on this page.
Sizes in millimetres, weights in kilograms, bulk density in kg per cubic metre (1 g/cm³ = 1,000 kg/m³). A filled bag is wider than its base, so enter the filled size; for a bag that rounds out, its filled diameter as both length and width.
1 m³ × 900 kg/m³ = 900 kg, 100 kg under the 1000 kg safe working load.
Filled in: Sackmaker’s standard bag, 87 x 87 cm inside the base and 130 cm tall for 1.0 m³, certified to 1000kgs. To size a bag, United Bags divides the SWL by the bulk density.
Filled, the bag takes 1150 × 1150 mm of the 1200 × 1200 mm pallet, leaving 50 mm and 50 mm of deck.
Sackmaker’s bag is 115 cm across when filled, here on Transoplast’s 1200 × 1200 mm pallet. FIBCA: the pallet must be of a size that the FIBC does not overhang the side.
Bags of 1150 × 1150 mm go 10 per layer, 1 high: 10, enough for your 10, and 10 × 901.5 kg = 9015 kg is within the 28380 kg payload.
One high in Triton’s 20 ft, since two 130 cm bags stand 2,600 mm. PBS: a 20 ft is loaded with 20-28 FIBCs, depending on the material and the bags; each weighs 1.5 kg on average.
Exporting powder in U-panel bags? Photograph a filled bag, mark its base, height, loops and spouts in SizeMarker and send it with the packing list.
Mark a photoBase × height as each maker prints it. SF is the safety factor.
| Bag | Size | SWL; SF; fabric or volume |
|---|---|---|
| Halsted BB-40UDSDuffle top, 14 x 18" bottom spout | 35x35x40" | 3000lbs (1365kg); 5:1; 170gsm uncoated |
| Halsted BB-50CDS | 35x35x50" | 3000lbs (1365kg); 5:1; 170+30gsm coated |
| Halsted BB-55CDS4K | 35x35x55" | 4000lbs (1820kg); 5:1; 220+30gsm coated |
| Halsted BB-354160UDS | 35x41x60" | 3000lbs (1365kg); 5:1 |
| Halsted BB-3760UDS | 37x37x60" | 3000lbs (1365kg); 5:1 |
| BAG Corp 3542SPCN4U | 35" x 35" x 42" | 4000 lbs; 35 Cubic Feet |
| BAG Corp 3572DSUN3U | 35" x 35" x 72" | 3000 lbs; 63 Cubic Feet |
| Uline S-22716Inside size; retailer | 35 x 35 x 50" | Up to 3,000 lbs; 5:1 one time use; 45 cu ft; 5.08 lbs |
| 1-ton bag, UK data sheetStart Safety; Cotecna-tested | 85x85x85 cm external | 1000 kg; 5:1; 130 gsm uncoated; 750 gr |
Sources: Halsted (BB-40UDS) · Halsted (BB-50CDS) · Halsted (BB-55CDS4K) · Halsted (BB-354160UDS) · Halsted (BB-3760UDS) · BAG Corp (3542SPCN4U) · BAG Corp (3572DSUN3U) · Uline (S-22716) · Start Safety (data sheet)
Sackmaker’s table for its standard bags; height of the bag in cm for each volume.
| Sackmaker | 76 cm base | 87 cm base | 95 cm base |
|---|---|---|---|
| Inner base | 76 x 76 cm | 87 x 87 cm | 95 x 95 cm |
| Outer base | 80 x 80 cm | 91 x 91 cm | 99 x 99 cm |
| Diameter when filled | 101 cm | 115 cm | 125 cm |
| 0.5 m³ | 85 cm | 65 cm | — |
| 0.9 m³ | 155 cm | 120 cm | 100 cm |
| 1.0 m³ | 175 cm | 130 cm | 110 cm |
| 1.2 m³ | — | 160 cm | 135 cm |
| 1.5 m³ | — | 200 cm | 165 cm |
| Standard bagsSackmaker | Certified to 1000kgs, 0.5 to 2.0 cubic mtrs | — | — |
Sources: Sackmaker (sizes) · Sackmaker
| Item | What the source says |
|---|---|
| ConstructionPalmetto | One piece of fabric forms 3 sides, two opposite sides and bottom; two additional sides are sewn in |
| In BAG Corp’s wordsBAG Corp | Two side panels attached to a single ‘u-shaped’ (side-bottom-side) unit |
| On data sheetsStart Safety | CONSTRUCTION: U+2 |
| Side seamsKanplas | Vertical side seams give the object a square appearance |
| Extended beltPalmetto glossary | This construction is not applicable for U-panel FIBCs |
| WidthsKanplas | 90cm-100cm; SWL 500kg to 2500kg at 5:1 or 6:1 |
| Most popular?Kanplas; Palmetto | Kanplas: the most popular FIBC shape; Palmetto calls the 4-panel bag the industry standard |
| When filledUS 10131470 | The sides round out or bulge, most about the middle of the walls |
| A tested 1000 kg bagCotecna certificate | 30 cycles at 2:1 (2000 Kg); failed at 5009 Kgs from side panel bottom stitching; passed 5:1 |
| Fill heightISO 21898:2024 | 2,0 times maximum the shortest horizontal dimension |
Sources: Palmetto (construction) · BAG Corp (3542SPCN4U) · Start Safety (data sheet) · Kanplas (U-panel) · Palmetto (glossary) · US 10131470 B2 · Cotecna test certificate · ISO 21898:2024
| Rule or figure | What it says |
|---|---|
| OverhangFIBCA | Use a pallet of appropriate size so the FIBC does not overhang the side |
| 35 X 35Langston | The standard size for inter-modal capabilities; fits on most 40″ x 48″ pallets |
| Filled diameterBulk-Pack | 45-48 in., designed to fit two across in a truck or a shipping container |
| SizingUnited Bags | Required volume = target SWL ÷ product bulk density |
| 1200 × 1200 mm palletTransoplast | 1200 × 1200 mm |
| A 115 cm bag on itOur calculation | 25 mm of deck each side |
| 20 ft insideTriton | 5,898 × 2,352 × 2,393 mm; 28,380 kg payload |
| 115 cm bags in that 20 ftOur calculation | 5 along, 2 across: 10 a layer; two 130 cm high stand 2,600 mm |
| Bags in a 20 ftPowder & Bulk Solids | 20-28 FIBCs depending on the bulk material and FIBC measurements; 1.5 kg each on average |
| Base sizes in mmOur conversion | 35 in = 889 mm; 50 in = 1,270 mm; 72 in = 1,829 mm |
Sources: FIBCA · Langston · Bulk-Pack · United Bags · Transoplast · Triton (20ft) · Powder & Bulk Solids
Stock U-panel bags in North America are 35 × 35 in at the base and 35 to 72 in tall: Halsted’s run 35x35x35" to 35x35x55", BAG Corp’s 35" x 35" x 42" to 35" x 35" x 72". Sackmaker’s metric bags have 76, 87 or 95 cm inner bases.
A bag in which one piece of fabric forms 3 sides, two opposite sides and the bottom, and two additional sides are sewn in (Palmetto); data sheets write it U+2. The vertical side seams give it a square appearance (Kanplas).
Halsted rates its U-panel bags at 3000lbs (1365kg) or 4000lbs (1820kg) at 5:1; BAG Corp’s 35" x 35" x 42" bag takes 4000 lbs in 35 Cubic Feet. To size one, United Bags divides the target SWL by the bulk density of the product.
Its base does: Langston says it fits on most 40″ x 48″ pallets. Filled, it is wider: Sackmaker’s 87 cm bag is 115 cm across and Bulk-Pack gives 45-48 in., and FIBCA says the FIBC must not overhang the side, so measure the filled bag.
Only if they are designed to be stacked, in a pyramid or against two retaining walls (FIBCA). ISO 21898:2024 has the label show the maximum number permitted on the bottom bag.
Buyers of minerals, resins and food powders ask for the bag’s base and height, its SWL and safety factor, the fill and discharge spouts and how the filled bags sit on a pallet. Mark the real bag, its seams, loops and spouts on your own product photo in SizeMarker, as in the picture at the top, and send one product card for WhatsApp or WeChat.
