Squarer filled footprint
A U-panel bag holds a rectangular section under load, so pallet and stack dimensions stay predictable instead of bulging into a round shape.
Size
75 x 75 x 110 cm up to 100 x 100 x 150 cm (typical)
SWL / Safety Factor
500 kg to 1,200 kg at 5:1; 6:1 on request
Top
Open top, filling spout, duffel top, or skirt with tie cord
Bottom
Flat bottom, discharge spout, or full-drop bottom
Lifting loops
Four corner loops, 25-30 cm clear height
Fabric & coating
140-200 gsm woven PP, uncoated or laminated at 20-25 gsm
What it settles: Sets out the three-piece panel layout and what it does to filled shape, stacking and sewing cost, with the dimensional tolerance stated instead of a general…
Best for: Granular minerals, resin pellets, sand and fertiliser where the filled bag has to keep a rectangular footprint for stacking or palletising.
Not the answer when: Use a tubular bag when the load is round-shouldered, stacking shape does not matter and fabric cost is the driver; use a four-panel bag when print…
Confirm before quoting: Fill weight and bulk density, filled dimensions and pallet pattern, required safety factor, top and bottom closures, liner requirement, and the UV exposure expected between filling…
/ Overview & Principle
HOW THIS BAG IS BUILT
The body starts as three pieces of woven polypropylene: one U-shaped panel that wraps the base and two opposite walls, plus two flat side panels sewn into the open edges. Because the base is part of the U, the bottom seam runs outside the footprint rather than across it.
Corner seams are double-folded and chain-stitched with polypropylene thread. Four corner loops are sewn into the vertical seams with reinforcement patches, spreading lift load along the seam instead of into a single stitch line, and the top hem carries the filling spout, duffel or skirt.
Panel geometry is set by the draw programme before weaving, so the bag holds its rectangular section under load better than a circular-woven tube does once filled and stacked.
Operational summary:
A flat-bottom FIBC whose body is one U-shaped panel joined to two side panels, giving a squarer filled footprint than a tubular bag. It is the usual answer when a filled bag has to sit level in a stack at a workable sewing cost.
/ Features
KEY DESIGN ADVANTAGES.
Predictable stack height
Flat side walls bear against each other, so a two-high or three-high stack stays aligned on the pallet.
Fewer fabric metres than four-panel
Three body pieces instead of four cut fabric and sewing time, which is usually why this construction is quoted ahead of a four-panel bag.
Print area that stays flat
Side panels are flat before filling, so branding and handling instructions print with less distortion than on a circular body.
Familiar seam layout
Corner seam positions are well understood on filling lines, so existing bag-handling equipment usually needs no change.
Base seam outside the footprint
Because the base is part of the U-panel, the bottom seam runs along the outer edge, so the filled bag rests on a flat fabric face instead of on a seam.
/ Build Types
TOP, BOTTOM & LINER TYPES.
The build types this family is quoted in, grouped the way a works order is written. Ask for the exact spout diameter, bottom style or liner grade on any of them.
TOP
800 x 560 px
Configurable
BOT
800 x 560 px
Configurable
LIN
800 x 560 px
Configurable
LOO
800 x 560 px
Configurable
FAB
800 x 560 px
Configurable
SIZ
800 x 560 px
Configurable
/ Construction & Performance
WHAT DECIDES THE SPECIFICATION.
5 points decide how this bag is specified. Use the arrows, the dots, or a swipe.
/ Configurations
CUSTOM CONFIGURATIONS & SIZING.
- Size
- 75 x 75 x 110 cm up to 100 x 100 x 150 cm (typical) Quoted as filled length x width x height; allow 3-5 cm tolerance on woven panels.
- SWL / Safety Factor
- 500 kg to 1,200 kg at 5:1; 6:1 on request Safe working load is confirmed per project against the loop and seam specification.
- Top
- Open top, filling spout, duffel top, or skirt with tie cord Spout diameter follows the filling nozzle; a duffel needs a closure cord long enough to reach round the fill head.
- Bottom
- Flat bottom, discharge spout, or full-drop bottom A full-drop bottom needs extra fabric in the U-panel and changes the folded packed height.
- Lifting loops
- Four corner loops, 25-30 cm clear height Loop width and stitch pattern are matched to the SWL; single-trip and multi-trip loops are sewn differently.
- Fabric & coating
- 140-200 gsm woven PP, uncoated or laminated at 20-25 gsm Coating closes the weave for fine powders; uncoated fabric passes air and suits granular loads.
- Liner
- None, loose PE liner, or sewn-in LDPE/HDPE liner A liner adds a second closure to handle at the fill head; state whether it must be dust-tight or only moisture-resistant.
- UV stabilisation
- 50-300 hours of UV exposure protection depending on additive loading The hours describe the additive target for the grade, not a guaranteed field life; state the storage and transit exposure expected.
- Printing
- Up to 4 colours per face, flexo on the side panels Side panels are flat before filling, so registration holds better than on a circular body.
- Packing
- Bales of 20-100 pieces, or palletised on request Packed volume runs roughly 25-30% above the same count of tubular bags.
/ Applications
WHERE THIS FAMILY IS QUOTED.
Silica Sand Packaging
A mineral processor bagging dried silica sand into 1.0-1.5 t lots must keep every bag inside the crane and fork-truck limit while…
Cement & Dry Mortar Packaging
Bagging cement and dry mortar at a batching plant or a dry-mix line: the bag has to survive a dusty, abrasive fill,…
Grain & Feed Packaging
Bagging grain, seed and compound feed at an elevator or feed mill: high fill volumes, seasonal peaks, and a product that has…
Bulk Handling at Ports & Warehouses
Bulk bags used inside ports, warehouses and transhipment sheds, where the bag has to survive a long chain of handlers, stacking in…
/ Performance
PERFORMANCE, TESTING & LIMITS.
1. Performance & working envelope
| Rated range | Rated for free-flowing granular and powder loads of roughly 0.4-1.2 t per bag at a safety factor of 5:1, with the filled bag resting on its flat base and lifted by four corner loops on a single hook or a four-point spreader. The envelope assumes a uniformly distributed load, a vertical lift and no dragging. Bulk density above about 1.2 t/m3 reduces the usable fill volume at the same finished size, so the height is recalculated for dense minerals. |
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2. How it is validated
| Testing | In-house: fabric weight and weave count checked on receipt, panel dimensions checked against the approved drawing, seam strength checked on production samples on the in-house tensile rig, and a trial fill with the customer's product where the fill line is available. Stitch count and loop position are inspected at the machine against the drawing. Third-party testing is arranged on request and quoted separately. |
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3. Limits
| Where it is not the answer | Not the right answer for fine powders that have to be dust-tight without a liner, for sharp-edged scrap that cuts the flat side panel, or where a round section is needed to shed load in a narrow chute. Sewing cost is lower than a four-panel bag, but the corner seam is still the first place to look if a bag fails at the loop. |
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Selection & Purchasing Guidance
- Best For:
- Granular minerals, resin pellets, sand and fertiliser where the filled bag has to keep a rectangular footprint for stacking or palletising.
- Consider Alternatives When:
- Use a tubular bag when the load is round-shouldered, stacking shape does not matter and fabric cost is the driver; use a four-panel bag when print registration or dimensional control has to be tighter than a U-panel holds.
- Must Confirm Before Quoting:
- Fill weight and bulk density, filled dimensions and pallet pattern, required safety factor, top and bottom closures, liner requirement, and the UV exposure expected between filling and use.
/ On site
SEEN ON SITE.
Loading, lifting and standing full — the working conditions the specification is written for. Use the arrows, or drag the rail.
1 / 6
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1000 x 625 px
Filled at the bagging line -
1000 x 625 px
Handled under the base -
1000 x 625 px
Lifted on the loops -
1000 x 625 px
Standing full in a yard -
1000 x 625 px
Base and seams after a load -
1000 x 625 px
Baled and stacked in the warehouse
Standard FIBC
THE OTHER BAGS IN THIS FAMILY.
Tubular FIBC
A seamless circular woven bag for free-flowing powders and granules; the lowest-cost standard construction where stackability is not the deciding…
View product →Baffle FIBC (Q Bag)
A four-panel FIBC with internal baffles or corner ties that hold a near-cube shape whether the bag is empty or…
View product →Circular FIBC
A seamless circular-woven bag closed with a round base, so free-flowing product empties completely and the body stays circular under…
View product →