QINFENG Custom FIBC manufacturer since 2001
Custom ventilated bulk bags
Custom Sizes UV Stabilized 1,000–1,500 kg SWL Options
Why a ventilated bag
Mesh panels or ventilated fabric allow air to circulate and help moisture escape. This supports firewood seasoning and helps reduce moisture buildup around onions, potatoes and other suitable produce during storage and transport.
The proportion of mesh to solid fabric is the main design decision: more mesh means faster air movement, less means more protection from rain, dust and light. That ratio is set from what the load has to do — cure, dry, cool or simply avoid condensation during transport.
Applications
For seasoning, storage and transport, with ventilation, outdoor durability and handling requirements confirmed for your operation.
For bulk storage and transport, with ventilation openings and bag construction matched to product size, filled weight and handling requirements.
Mesh panels or ventilated woven fabric let air pass through the body, so moisture given off by firewood and suitable fresh produce leaves the bag instead of sitting on the load.
Four-side mesh, mesh on two sides with ventilated fabric on the other two, or ventilated fabric all round. The three are set out below, and the drawing for your bag settles which one you get.
UV-stabilised material is used against sunlight degradation; the level is set by where the bag is stored, how long it stands outdoors and how it is handled.
Fabric, mesh, seams and lifting attachments are specified together for the agreed working load. Capacity comes from the whole construction, not from the number of mesh panels.
Lifting-loop and bottom configurations are matched to your filler and your unloading process, with tipping handles or discharge designs where the application suits them.
Dimensions, top closure, labels and print are set to your filling line, your product identification and your branding. A vented body gives less printable area, and the print is quoted at that size.
Venting options
The venting pattern belongs in the quote. Panel arrangement, materials and dimensions are confirmed on the approved drawing before production, and each construction below is set out by its panels and by what has to be confirmed before quoting.
01
Four-sided mesh
For applications where air movement comes first.
Mesh replaces the solid fabric on all four sides; the body keeps its shape, its loops and its outlet. Best suited for firewood and applications requiring maximum airflow.
What to confirm before quoting
The aperture, the product it has to hold, and the fill weight the construction carries.
02
Two-sided mesh + two-sided breathable fabric
A mixed panel construction, or a match to the bag already in use.
Two opposite sides are mesh, the other two perforated breathable fabric; both panels pass air. Best suited for applications requiring a balance between airflow and fabric coverage.
What to confirm before quoting
The two materials, which faces take the mesh, and the handling the bag goes through.
03
Breathable fabric on all four sides
For applications that specify a breathable woven body.
Perforated fabric on all four sides: air passes through, no open mesh. Best suited for applications requiring distributed ventilation without open mesh panels.
What to confirm before quoting
The venting openings, product retention and the load the construction carries.
Ventilated constructions are not rainproof. Outdoor storage and any additional cover requirements should be confirmed separately.
How this bag is specified
Every load has different requirements. From firewood and logs to onions and potatoes, we tailor the ventilation, fabric strength and bag construction to suit the product, handling process and storage conditions.
The right construction starts with understanding your load.
Start from the common 1 m³ and 1.5 m³ sizes, then set the venting construction and the load rating against your product, how it is stored and how it is handled.
Need to match an existing bag? Send us your photos or specification. Get a quote →
/ Made to your specification
Top cover, emptying, tipping aids, print, seam and fabric: each one is set from how the bag is emptied, stacked and labelled, and settled on the drawing before production.
On your line
Bags stacked outdoors, with rain and dust over the load.
What we build
A sewn top cover where weather reaches the bags.
On your line
Tipped in one go at the far end, or emptied by hand where there is no tipper.
What we build
Flat bottom for hand emptying; a discharge spout where the bag is tipped.
On your line
The bag has to swing clear and let go without a second pair of hands on it.
What we build
Tipping handles, or a bottom that drops the load clear.
On your line
Brand and batch read from the aisle, the bag never turned.
What we build
One or two colours, label and print placed off the mesh.
On your line
The joint between mesh and solid fabric is where a vented body is checked first.
What we build
Joint type and strength are specified with the fabric and counted per batch.
On your line
Moisture given off by the load has to leave the bag, not settle on the inside of it.
What we build
Mesh or perforated fabric between solid panels; the mesh-to-solid ratio is settled on the approved drawing.
Samples
A vented bag is judged with the load inside it: whether the mesh moves enough air for this product, whether the aperture holds that product in, and how the body stands after a spell outdoors. Ask, and a sample goes out — so those three are answered on your site rather than on a photograph.
What we send
Yes, and we would rather you tested than guessed. On a standard venting pattern one or two bags go out free of charge — enough for a trial fill with your own product and a short storage trial where the bags will stand. On a non-standard pattern or aperture the sample cost is confirmed separately, and the courier is paid by you.
No. Each sample is made to the specification in front of us — which faces take the mesh, and at what aperture — so the bag you test is the bag the production run follows. Allow making time for that before the order is released.
Production is quoted and scheduled on the approved drawing, not on the enquiry.
Before we quote
Our quality efforts
In-house checks cover fabric and mesh weight, the seams, filled dimensions and a visual check of the mesh attachment on each batch. Third-party testing is arranged on request and quoted separately.
On site
Loading, lifting and standing full — the conditions the specification is written for.
1 / 9
Venting pattern drawing showing mesh panel positions and the solid-to-mesh ratio.
Sample bag available for a trial fill and a short storage trial with your product.
Venting drawings and sample bags can be shared with a named buyer on request. Trial storage results belong to the customer's product and conditions.
FAQ
Not necessarily. Strength depends on the mesh specification, seams, reinforcement and lifting construction. We confirm the SWL and safety factor for the complete bag design.
No. Mesh passes water as readily as it passes air, and none of the three constructions adds a rain cover. Ventilation and weather are settled separately: the venting pattern is chosen for the airflow the load needs, and outdoor storage or any cover the store needs is confirmed with the order — a sewn top cover is quoted as its own line.
Yes. We can specify UV-stabilised materials for up to 2 years of outdoor use, subject to the agreed exposure conditions.
The UV specification is determined by the destination country, sunlight exposure, storage conditions and handling requirements. The confirmed UV grade and outdoor-use commitment will be stated in the quotation and approved specification.
Yes — send photographs and the specification, or the bag itself. A sample bag is photographed, measured and physically tested (fabric weight, yarn count, UV additive and liner thickness), which also shows whether the bag is over-built or at structural risk, and it is kept for the production run and not shown to another customer. The venting pattern is then settled on the approved drawing.
Standard venting patterns ship as one or two bags free of charge, with the courier (FedEx or UPS) at your cost; other patterns and apertures are quoted separately. What goes with an order is written and photographic evidence — the drawing, the sample, photographs and the batch record. Whether a run can be filmed is agreed with the order, because it depends on the line and the test.
The load and its smallest piece, the fill weight and the bag size, the venting pattern or the mesh-to-solid ratio you want, whether the filled bags stand indoors or out and for how many months, the print area and the packing, and the destination port. Those seven are what the quotation is built from.
Both follow the configuration — bag size, venting pattern, print and packing each change what the line has to run — so neither is a fixed figure on this page. Both are stated on the quotation for the specification you approve.
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Tell us what you pack, the filled weight, bag dimensions and storage conditions. Our team will help you select the right ventilation construction.