Product range

PP Woven Bags (Polypropylene Woven Sacks)

Name: PP woven bags
Brand: UnisunPack
Availability: InStock

Woven polypropylene bags manufactured in our own factory in Wenzhou, China. Laminated or unlaminated, with or without an inner liner, in every common closure type, printed in up to 8 colours and produced to hold anything from 5kg of rice to 50kg of fertiliser.

Rice bag produced by UnisunPack for export customers

25kg printed PP woven maize meal bag for Mashamba breakfast meal

50kg yellow PP woven industrial sugar bag printed for Kafue sugar

50kg BOPP printed PP woven premium rice bag with family graphic artwork

Plain white 25kg PP woven bag with green stripes, 88 percent purity marking

Click a thumbnail to change the view, or the photo itself to enlarge it.

Built from woven polypropylene tape, not film

PP woven bags start as polypropylene granules, extruded into tapes, woven into fabric on circular looms and then converted into sacks. That structure is why they handle drop after drop in transit, why they breathe, and why they cost less per tonne carried than almost any other packaging format. UnisunPack has been weaving and converting them for over 20 years.

Because we control every stage — extrusion, weaving, lamination, printing, cutting, gusseting, liner insertion and sewing — the bag you approve at sample stage is the bag you receive in the container. Fabric weight is checked as it comes off the loom, print is checked at first off, and every bale is inspected against your specification before it is closed.

Whether you already have a proven bag design or need us to recommend the construction from scratch, send us your product, your bag weight and a photo of your filling line. We will tell you honestly which fabric weight, closure and liner will do the job.

Features and options

Tear resistant fabric that reduces product loss and reworking
Custom two sided printing in up to 8 colours
BOPP lamination for photo quality graphics, gloss or matt finish
Available in any colour, including transparent fabric
Flat weave or anti-slip weave for pallet stacking
Heat cut, cold cut or hemmed top finishes
Valve or open mouth filling
Inside or separate liner, sewn in or loose
Gusseted or pillow / tubular construction
Micro perforations for products that need to breathe
Easy open tab for retail and consumer packs
Food grade and UN certified options

Bag styles and closure options

The closure is usually the difference between a bag that runs on your line and one that jams it. We produce all of the common constructions:

Valve top on a PP woven bag for high speed automatic filling

Valve top PP woven bags

For high speed automatic filling through a valve. Cleaner filling and less dust.

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PP woven bag hemmed top construction detail

Hemmed top bags

Folded and stitched top for a neat finish and easy handling by hand.

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PP woven bag square bottom construction for retail presentation

Block bottom / square bottom

Stands up on the shelf and takes high quality printing on the face.

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See all bag styles and closure types →

Typical specification

Fabric weight	55 to 130 gsm (grams per square metre). We recommend the weight from your bag capacity and stacking requirement.
Bag capacity	5kg to 50kg. Heavier or oversized constructions can be produced on request.
Denier / tape	Commonly 900D to 1200D virgin polypropylene, or recycled tape where the application allows.
Common bag sizes	10kg 45 × 65cm · 25kg 55 × 90cm · 50kg 60 × 105cm · gusseted, flat or block bottom variants. Any custom size is available.
Lamination	Unlaminated, inside laminated, outside BOPP laminated, or PP laminated.
Liner	No liner, separate PE liner, sewn-in PE liner, or loose liner fixed at the bag mouth.
Printing	Flexo printing up to 8 colours, or rotogravure on BOPP laminated bags, two sided.
Closure	Valve, open mouth, hemmed top, heat cut, cold cut, block bottom, sewn bottom.
Handles	Die-cut handle, patch handle, or no handle.
Certification	Food grade (FDA / EU food contact declarations) and UN certified bags for dangerous goods on request.
MOQ	Low minimum order quantity for a first order — ask us for your exact size.
Packing	500 pcs / 1000 pcs per bale, or palletised. Loading photos sent before shipment.

What PP woven bags are used for

Woven sacks are the default packaging for dry, granular and powdered goods that have to survive a long journey and repeated handling:

Rice, maize, wheat, barley and other grains
Flour, sugar, salt and starch
Pulses, beans, nuts and seed
Animal feed, poultry feed and fish feed pellets
Fertiliser, urea and NPK blends
Cement, sand and construction materials
Charcoal and briquettes
Chemicals, resins and mineral powders
Pet food and aquafeed
Industrial waste and logistics packaging

Not sure which material suits your product? Send us the details or compare with multi-layer kraft paper bags, which are often the better choice for very fine powders and for retailers who prefer paper.

Quality control

ISO 9001:2015 quality system

Documented inspection at fabric, print, converting and final packing stages.

Food grade and UN certified

Approved production for standard food grade bags and UN certified dangerous goods bags.

Traceable quality record

Batch records kept against your order so a problem can be traced back to the loom and the shift.

Third party inspection welcome

SGS, BV, Intertek or your own QC team — we will schedule the visit and arrange a live video inspection if you prefer.

PP woven bag FAQ

What is the difference between a laminated and an unlaminated PP woven bag?

An unlaminated bag is plain woven fabric: strong, breathable and the cheapest option, best for grains, feed and products that must not trap moisture. Lamination adds a film layer — PP laminated or BOPP laminated — which closes the weave, stops fine powder escaping and gives a smooth surface for high quality printing. If your product is a fine powder or you sell from a retail shelf, laminate it. If it needs to breathe, do not.

How do I choose the fabric weight (gsm) for my bag?

Work backwards from the load and the stacking. A 25kg bag of grain usually runs comfortably at 70 to 80 gsm; a 50kg bag of dense fertiliser or a bag that will be stacked five high needs more, often 90 to 110 gsm, and may need anti-slip weave. Tell us the product, the bag weight and how high the pallets are stacked and we will specify the fabric weight, and explain the reason.

Can you supply food grade PP woven bags?

Yes. Our factory is approved to produce standard food grade bags, using virgin food grade resin and food contact compliant inks and liners, with the documentation to match. If your market requires FDA or EU food contact declarations, tell us at the quotation stage so the correct materials and paperwork are built into the order.

Do you make UN certified bags for dangerous goods?

Yes, we are certified to produce UN bags. UN certified packaging has to be tested for the specific dangerous goods class and packing group, so send us the substance, the packing group and the bag weight and we will confirm what is achievable and what testing is required.

How many colours can you print, and can I print on both sides?

Up to 8 colours by flexo printing on standard woven fabric, and up to 8 colours by rotogravure on BOPP laminated bags, which gives noticeably sharper detail and photographs. Two sided printing is standard. We prepare a digital proof showing the bag layout, seam positions and the exact print area before any plate is made.