The structures
Three ways to make a bag body
Seamless tubular body
Integrally woven into a seamless cylindrical body by circular weaving, with no vertical seams; top and bottom pieces are sewn separately. Fewer seams means fewer leak paths — useful for fine powders.
Four-panel stitched body
Four independent rectangular panels — front, back, left and right — sewn vertically to enclose the bag. All four sides are separate fabric pieces; the most flexible for custom dimensions.
U-panel body
One U-shaped main fabric connected to the bottom plus two side panels. Only two vertical seams, and the base is a continuous piece of fabric — a good balance of shape and output.
Comparison
Side by side
| Tubular | Four-panel | U-panel | |
|---|---|---|---|
| Vertical seams | None | Four | Two |
| Base | Separate sewn panel | Separate sewn panel | Continuous U-shaped fabric |
| Fine-powder leak risk | Lowest | Highest | Medium |
| Shape / squareness | Good | Good | Very good |
| Dimension flexibility | Limited by loom width | Highest | High |
| Applicable types | Type A / B / C / D, custom | Type A / B / C / D, custom | Type A / B / C / D, custom |
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