Dimensions / Industrial & logistics / FIBC bulk bags / Baffle (Q-bag)
A baffle bulk bag, or Q-bag, has pieces of fabric sewn across each corner of a tubular or four-panel bag to keep it square and stable and to use storage or shipping space better (Palmetto). Stock baffle bags are wider than standard ones: 41" x 41" at BAG Corp and 42x42" at Halsted and Uline, against 35 × 35 in, 40 to 63 in tall; Kanplas makes them 105cm to 112cm wide. Uline’s 42 x 42 x 44" Q-bag holds up to 3,000 lbs in 45 cu ft and weighs 5.90 lbs. Plastiflex sizes its Q-bags to chemical pallets: 1050 x 1050 mm for the CP3, 1140x1140x138mm. Makers claim 20% to 30% more product in the same space; a patent notes the much higher cost, from more material and slower sewing.
| Base, stock square bags | Heights, Halsted, BAG Corp, Uline | SWL, stock bags |
|---|---|---|
| 41–42in1,041–1,067 mm | 40–63in1,016–1,600 mm | 2200–3000lbs998–1,361 kg |
Sources: BAG Corp (41 x 41 x 44), Halsted (BB-384163), Halsted (BB-4255UDS). Checked October 2026.
Uline’s 42 x 42 x 44" Q-bag is entered with a CP3 pallet and two high in 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.
1.27 m³ × 800 kg/m³ = 1016 kg, 345 kg under the 1361 kg safe working load.
Filled in: Uline’s 42 x 42 x 44" Q-bag, 45 cu ft (1.27 m³) and up to 3,000 lbs (1,361 kg) at 5:1.
Filled, the bag takes 1067 × 1067 mm of the 1140 × 1140 mm pallet, leaving 73 mm and 73 mm of deck.
Corner baffles keep it square (Uline), so its 1067 mm base goes on Pacurion’s CP3, 1140x1140x138mm. Some bulging stays between the baffle points (US 10131470).
Bags of 1067 × 1067 mm go 10 per layer, 2 high: 20, enough for your 20, and 20 × 1018.7 kg = 20374 kg is within the 28380 kg payload.
Two high, 1118 mm each, the bags stand 2,236 mm in Triton’s 20 ft. FIBCA: stack in a pyramid, each bag on four below, or against two retaining walls.
Selling container loads in Q-bags? Photograph a filled bag, mark its square base, height and spouts in SizeMarker and send it with the packing list.
Mark a photoBase × height as each maker prints it.
| Bag | Size | SWL; SF; build or volume |
|---|---|---|
| Halsted BB-4255UDSBaffle joints (Q joints), 100+20gsm coated | 42x42x55" | 3000lbs; 5:1; 4+1 panel baffle |
| Halsted BB-424240 | 42x42x40" | 3000lbs (1350kg); 5:1; 160gsm |
| Halsted BB-4048UDS | 40x48x48" | 3000lbs; 5:1; 4+1 panel baffle |
| Halsted BB-384163 | 38x41x63" | 3000lbs; 5:1 |
| Halsted BB-55UDSBOn the standard base | 35x35x55" | 3000lbs (1350kg); 5:1; 4+1 panel with baffles |
| BAG Corp baffled 41 x 41 x 44 | 41" x 41" x 44" | 2600 lbs; 45 Cubic Feet |
| BAG Corp baffled 41 x 41 x 40 | 41" x 41" x 40" | 2200 Lbs; 39 Cubic Feet |
| Uline S-13644Retailer | 42 x 42 x 44" | Up to 3,000 lbs; 5:1; 45 cu ft; 5.90 lbs |
| Uline S-19915Retailer | 42 x 42 x 55" | Up to 3,000 lbs; 5:1; 55 cu ft; 6.80 lbs |
| Kanplas form-stable bags | Width varies from 105cm to 112cm | 500kg to 2500kg; 5:1 or 6:1 |
Sources: Halsted (BB-4255UDS) · Halsted (BB-424240) · Halsted (BB-4048UDS) · Halsted (BB-384163) · Halsted (BB-55UDSB) · BAG Corp (41 x 41 x 44) · BAG Corp (41 x 41 x 40) · Uline (S-13644) · Uline (S-19915) · Kanplas (baffle)
Plastiflex pairs each Q-bag size with a CP pallet; pallet sizes from Pacurion.
| Q-bag size (mm) | CP pallet |
|---|---|
| 750 x 1100 | CP2, 1200 x 800 x 138 mm |
| 880 x 1050 | CP1, 1200 x 1000 x 138 mm |
| 1050 x 1050 | CP3, 1140x1140x138mm |
| SWLPlastiflex | 500-2000 kg |
| Safety factorPlastiflex | 5:1 for one-way bags; 6:1 for multitrip and UN-coded bags |
| HeightPlastiflex | Not more than twice the bottom size, to keep it stable |
Sources: Plastiflex · Pacurion (CP pallets)
| Item | What the source says |
|---|---|
| BafflePalmetto glossary | Fabric sewn across each corner of a tubular or four-panel bag, for squareness, stability and space |
| HolesKanplas | Pre-cut with oval dye-cut holes, sewn diagonally across each corner |
| StackingUline | Corner baffles keep bag square for easy stacking |
| On the palletLC Packaging | Stays upright within the pallet dimensions |
| More bags per areaUS 8678652 | Square bags reduce or eliminate the gaps between the corners |
| More product, as makers claim itPlastiflex; United Bags; Kanplas; Palmetto | 20% and more; up to 25%; 25%-30%; up to 30% |
| CostUS 10131470 | Much higher cost: more material, and the manufacturing process is much slower |
| Still some bulgeUS 10131470 | Some bulging remains between the baffle connecting points |
Sources: Palmetto (glossary) · Kanplas (baffle) · Uline (S-13644) · LC Packaging · US 8678652 B1 · Plastiflex · United Bags · Palmetto (construction) · US 10131470 B2
| Rule or figure | What it says |
|---|---|
| OverhangFIBCA | Use a pallet of appropriate size so the FIBC does not overhang the side |
| Uline S-13644 in metricOur conversion | 1067 × 1067 × 1118 mm; 45 cu ft = 1.27 m³; 3,000 lbs = 1,361 kg; 5.90 lbs = 2.68 kg |
| S-13644 on a CP3Our calculation | 73 mm of deck on each side |
| StackingFIBCA | Pyramid, each bag on at least four lower bags, or supported by two retaining walls |
| 20 ft insideTriton | 5,898 × 2,352 × 2,393 mm; 28,380 kg payload |
| S-13644 in that 20 ftOur calculation | 5 along, 2 across: 10 a layer; two high stand 2,236 mm: 20 |
| Stock bases and heights in mmOur conversion | 41 in = 1,041 mm; 42 in = 1,067 mm; 40 in = 1,016 mm; 63 in = 1,600 mm; 2200 lbs = 998 kg; standard 35 × 35 in bags: 889 mm |
Sources: FIBCA · Uline (S-13644) · Pacurion (CP pallets) · Triton (20ft)
Stock square baffle bags are 41" x 41" (BAG Corp) or 42x42" (Halsted, Uline) at the base and 40 to 63 in tall; Halsted also makes 40x48x48" and 38x41x63". Kanplas makes them 105cm to 112cm wide, and Plastiflex in 750 x 1100, 880 x 1050 and 1050 x 1050 mm.
A tubular or four-panel bulk bag with pieces of fabric sewn across each corner, to keep it square and stable and to use storage or shipping space better (Palmetto). The baffles have oval holes so the product flows through (Kanplas).
Makers claim 20% and more (Plastiflex), up to 25% (United Bags), 25%-30% (Kanplas) or up to 30% (Palmetto) more product in the same space. These are makers’ claims; the gain comes from filling the corners, and some bulging remains between the baffles (US 10131470).
They are made for it: Uline says corner baffles keep the bag square for easy stacking. FIBCA still says to stack only bags designed to be stacked, in a pyramid or against two retaining walls.
More material is needed to make the bag and the manufacturing process is much slower, says US patent 10131470.
Uline’s 42 x 42" Q-bag, 1067 mm square, goes 5 along and 2 across: 10 a layer in Triton’s 20 ft, and two high at 1118 mm each stand 2,236 mm, so 20, by our calculation.
Buyers who pay by the container ask whether the bags are baffled, how square they stay filled, the base and height, the SWL and how many go in a 20 ft two high. Mark the real bag, its square base 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.
