By construction
Circular
No vertical seams
Woven as a seamless tube, no vertical seams at all, so fine powders have nowhere to sift.
Product description
A circular or tubular bag is woven on a circular loom as one continuous tube. Only the top and bottom panels are sewn in, which means the body has no vertical seams whatsoever.
That single property decides most purchases. The classic failure mode for fine material is sifting through the perforations a needle makes in a seam. With no vertical seam there is no such path, so circular bags handle flour, cement and fine minerals, often without an inner liner. The cost is shape: they go noticeably round when filled and have the poorest cube efficiency of the standard builds.
Uses
- Fine powders
- Hygroscopic material where moisture ingress through seams is a risk
- Applications where a liner would otherwise be needed purely for sift control
Industries we supply this for: Food Service, Ingredients, Sugar, Mineral
Configurable options
Everything below is specified per order. Nothing here is a fixed catalogue number.
| Static type | A, B, C or D |
|---|---|
| Top | Open, duffle, flap, spout, conical spout |
| Bottom | Flat, spout, conical spout |
| Loops | Corner (four-point), cross corner |
| Fabric | Coated or uncoated |
| Liner | None, loose, glued-in, frequently not required |
| Add-ons | Document pouch, custom print |
Customizable options
Every option below is available on this product. They change how the bag fills, lifts and empties.
Lift loops
Corner loops
One loop sewn into each corner seam. The standard build, and the most affordable way to lift a bag.
Cross corner
Sewn into eight points across opposite corners, so the loops stand upright and the forklift operator is not fishing for four floppy straps.
Tunnel loops
A sleeve of body fabric spanning each side, corner to corner. The forks go straight through: the easiest pick where headroom is tight.
Stevedore straps
Double-layer straps across the corner loops, so the bag can be taken on one or two points instead of all four.
Double loops
Two lifting points instead of four, where that suits the load and the lift better.
Top
Spout top
A cylindrical spout sewn into the top panel. 14 in diameter by 18 in long as standard, sized to your filling head.
Spout top with flap
A spout top with a flap panel over it, tied down so the spout stays covered in transit.
Duffle top
A skirt the full width and depth of the bag, so the top opens completely and ties closed.
Flap top
A closed panel with a flap sewn along one seam, tied down over the mouth.
Open top
No panel at all. Fastest to fill where dust and weather are not a concern.
Conical spout top
A top panel that tapers up into the spout. Double spout tops are available too, specified to your filling equipment.
Bottom
Discharge spout
The standard 14 by 18 in spout, tied off. A wider spout is worth specifying for material that bridges.
Flat bottom
Closed base for product that is emptied by tipping or cutting.
Full bottom discharge
The whole base opens, for material that will not flow through a spout.
Spout protection
A flap, or a petal or iris closure, over the discharge, for when the spout must stay clean in transit.
Conical discharge spout
The base narrows into the spout, which helps product that is slow to flow empty completely. Specified to your equipment.
Add-ons
Baffles
Corner panels that hold a cube instead of a bulge: roughly 25 to 30% more volume in the same footprint, and it stacks safely.
Sift-proof seams
Filler cord sewn into the seam, for product fine enough to work through the stitching.
Document pouch
A sealed pouch for the paperwork which needs to travel with the bag.
Safety bands
A reinforcing band around the top, for added strength at the lift.
Custom print
Up to four sides, for branding and traceability on the line.
Liner
No liner
Fabric alone, where the product needs no barrier. The cleanest liner is the one you never have to specify.
Loose liner
Dropped in, not attached. Affordable insurance against fine powder finding the seams.
Glued-in liner
Bonded to the bag so it stays in place through filling and discharge, which is what a food or pharmaceutical audit expects to see.
Antistatic liner
Specify this inside a Type C or Type D bag, so the liner carries the same static classification as the fabric.
Foil liner
Designed for product that is filled hot, the foil laminate holds temperatures that would deform a polyethylene liner.
Fabric
Uncoated
Breathable, and the default build.
Coated
A thin polypropylene coat over the weave, for fine powder and moisture resistance.
How the constructions compare
| Construction | Vertical seams | Typical SWL (lb) |
|---|---|---|
| U-Panel | 4 | 2,205–3,000 |
| Four-Panel | 4 | 2,205–3,000 |
| Circular | 0 | 2,205–3,000 |
Load figures are indicative industry ranges shown for comparison. Every bag is made to order, so tell us your fill weight and we will specify to it.
Frequently Asked Questions
Do I still need a liner?
Often not, which is the point. With no vertical seams the main sift path is gone. A liner is still worth specifying for a moisture barrier or where the material demands a food-contact surface.
Why is the load rating lower?
Circular bags typically sit a little below U-panel and four-panel on safe working load. Where you need both seamlessness and a high load rating, tell us the fill weight and we will work to it.
Will it stack?
Less well than the other builds. It goes round when filled. If you need seamless and square, a baffle construction with sift-proof seams is the usual compromise.
Related products
U-Panel
One continuous panel forms two sides and the base, so the load is carried by fabric rather than by stitching.
FIBC Liners
Polyethylene liners fitted inside a bulk bag for moisture and contamination protection.
Food Grade
100% virgin polypropylene resin, produced in certified clean room conditions.
Send us the load, not a part number.
Material, fill weight, how you fill and how you discharge. That is enough for us to come back with a specification.