Industrial & logistics · Reference
A standard FIBC bulk bag has a 90 × 90 cm (35 × 35 in) U-panel base, stands 110–200 cm tall, and carries 1,000–2,000 kg — tested to a 5:1 safety factor (single-trip) or 6:1 (multi-trip) per ISO 21898.
A bulk bag (FIBC) is specified by its square base length and width — sized to match a standard pallet — plus its overall filled height.
| Bag style / component | Standard size | Height range | Manufacturing tolerance |
|---|---|---|---|
| U-panel / four-panel base | 35 × 35 in | 30–70 in, in 5 in steps | ±2 cm (width & length) |
| Circular / tubular base | 36 × 36 in | 30–70 in, in 5 in steps | ±2 cm (width & length) |
| Overall bag height | — | 30–70 in | ±2 cm |
| Fill & discharge spout | 14 in dia. × 18 in long | — | +2 cm / −1 cm (width), ±2 cm (length) |
| Duffle (top skirt) length | 33 in | — | ±2 cm |
| Lift loop height | 10 in standard / 15 in custom | — | +2 cm / −1 cm |
| Fabric weight (woven PP) | — | — | ±5% |
| Industry / load type | Base footprint | Height | Volume | Safe working load (SWL) |
|---|---|---|---|---|
| Chemicals & minerals | 90×90–100×100 cm | 110–140 cm | 0.9–1.2 m³ | 1,000–1,500 kg |
| Food grains & sugar | 95×95–100×100 cm | 140–180 cm | 1.2–1.6 m³ | 1,000–1,500 kg |
| Cement & construction | 90×90–95×95 cm | 110–130 cm | 0.9–1.1 m³ | 1,500–2,000 kg |
| Agricultural products | 100×100 cm | 160–200 cm | 1.4–2.0 m³ | 1,000–1,500 kg |
| Rating / term | Safety factor (SF) | Rule |
|---|---|---|
| Single-trip / single-use bag | 5:1 | Tested to 5× rated SWL; one fill–lift–transport–empty cycle only — must not be reused |
| Multiple-trip / reusable bag | 6:1 | Tested to 6× rated SWL; must be cleaned, reconditioned, inspected, tracked & re-tested after each cycle |
| Safe Working Load (SWL) — definition | — | Maximum load a bag is designed and rated to carry, in kg or lb |
| Safety Factor (SF) — definition | 5:1 or 6:1 | Ratio between the bag's tested breaking load and its rated SWL, set by ISO 21898 |
Source: National Bulk Bag — FIBC Bulk Bag Safety: 5:1 vs 6:1
A spec table only helps if the buyer reads it. Many don't — shoppers routinely try to judge a product's size straight from the images, and wrong size or fit is the most-cited reason things get returned. The fix is to mark the real dimensions on the photo itself, where the buyer is already looking.
SizeMarker snaps dimension lines to the fibc bulk bag's edges and exports at Amazon or Alibaba size, so the measurement is accurate and legible — not a guess typed over the picture. That answers the size question up front and cuts pre-sale questions and size-driven returns.
Related: Industrial spec diagram maker · Product spec sheet maker · Best tools to add dimensions to product photos · Ecommerce returns & size statistics
The most common FIBC base is 35 × 35 in for U-panel and four-panel bags (FlexSack); the metric-market equivalent is typically listed as 90 × 90 cm, per Mewar Polytex's and JEBIC's size charts. Circular/tubular bags use a slightly larger 36 × 36 in base.
Bag height typically ranges 30–70 in (76–178 cm) in 5 in steps for the US market, while metric 'jumbo bag' listings commonly span 110–200 cm depending on the load — cement bags run shorter (110–130 cm) and agricultural bags taller (160–200 cm), per Mewar Polytex.
A 5:1-rated bag is single-trip only — tested to 5× its rated safe working load and must never be reused. A 6:1-rated bag is multiple-trip — tested to 6× SWL — but must be cleaned, inspected and re-tested between uses, per ISO 21898 and National Bulk Bag's safety guidance.
Most FIBCs are rated 1,000–2,000 kg SWL: roughly 1,000–1,500 kg for chemicals, minerals and food grains, and up to 1,500–2,000 kg for cement and construction materials, per Mewar Polytex's industry sizing table.
A baffle bag adds internal fabric panels across each corner of a U-panel, four-panel or circular FIBC, letting it hold its square shape and up to 30% more product in the same footprint — improving container utilization on B2B export shipments, per Southern Packaging's baffle bag guide.
Every figure on this page is traced to a named source, linked under each table. Standard sizes come from published standards and established industry references; where a size is a typical range or varies by manufacturer, we say so. Sizes vary by region, model and revision — treat these as the standard reference, and confirm the exact spec of the item you are selling.
Mark accurate dimensions and specs on your product photos in minutes. Free to start.
Start free · 30 credits on sign-up