Engineered for the Heavy Lift — custom bulk bags from 500kg to 2000kg.
SITONG designs and builds Flexible Intermediate Bulk Containers (FIBCs) — jumbo bags, big bags and ton bags — for safe, efficient handling of dry flowable materials. Every bag is built around its safe working load: from lifting loops and seam construction to liners and anti-static treatment, we engineer the whole container, not just the fabric.
Since 1998 we have focused on one thing most woven-bag plants don't: the safe containment and lifting of one-tonne loads. That means our engineering thinking starts with the safe working load (SWL), the lifting-loop geometry and the seam path — then works backwards to the fabric, tape and resin.
Our vertically integrated plant runs resin extrusion, circular weaving, webbing and loop production, sewing, cleaning and inspection under one roof. That control lets us guarantee consistent SWL performance, clean food-grade interiors and reliable delivery for distributors, blenders, chemical producers and miners on six continents.
A jumbo bag rarely fails in the cloth — it fails at a loop or a seam. So making an FIBC is really building a safe load path: resin becomes tape, tape becomes fabric, and fabric becomes a container engineered around its rated load.
100% virgin polypropylene pellets for food-grade and high-strength bags, with recycled-content options for non-food industrial use — the foundation every later stage builds on.
Resin is melted and drawn into flat tapes at a controlled denier, giving the woven fabric the tensile backbone a heavy lift demands.
Circular looms weave seamless tubular fabric — the preferred body for FIBCs because it removes side seams and concentrates strength in the cloth.
The most safety-critical part: lifting loops and body belts are woven and cut to spec, built to carry the bag's rated load — the feature that makes an FIBC a bulk container rather than a sack.
Skilled operators join body, spouts, base and loops on programmed sewing lines, with seam pattern and stitch density set to the bag's load class.
The sewn bag is folded, palletised and made dispatch-ready — the build closed, ready to carry your product from our floor to your port.
We don't outsource the parts that decide whether a bag lifts safely. Here is where each stage is made and checked.
Where a small sack is judged on print and seal, a bulk bag is judged on whether it lifts, holds and discharges without failure. Our checks are built around that reality.
Top-Lift & Loop Test
Loops and bodies are lifted to the rated safety factor (5:1 single-trip, 6:1 reusable) so the bag proves its SWL before shipment.
Seam & Stitch Inspection
Every seam is checked for stitch density, even tension and secure termination — the points where a heavy bag is most likely to fail.
Anti-Static Verification
For Type C and Type D bags we verify conductivity / static-dissipative performance so flammable-dust and solvent environments stay safe.
Fabric Tensile Test
Woven fabric is sampled for tensile and tear strength to confirm the body cloth matches the design load path.
Clean-Room Hygiene
Food-grade runs pass through dedusting and cleaning so interiors meet the hygiene expectations of sugar, flour and starch buyers.
Certified Systems
BRC, ISO 9001 (quality), ISO 14001 (environment) and OHSMS (safety) underpin every line. Incoming material is qualified and every batch is recorded for full traceability.
Tell us what you fill, how you fill it and how you move it. We engineer the bag — spouts, loops, baffles, liner and treatment — to that exact job, as standard or fully bespoke OEM/ODM under NDA.
Learn more| Parameter | Typical Range / Option |
|---|---|
| Safe Working Load (SWL) | 500 kg – 2 000 kg (commonly 1 000 kg) |
| Safety Factor | 5:1 single-trip · 6:1 reusable |
| Lifting Loops | 4-loop (corner), 2-loop, or 1-loop stevedore; cross-corner options |
| Top Design | Open top · duffle/skirt · filling spout (with petal or star) · with tab |
| Bottom Design | Flat/closed · discharge spout · conical · with spout |
| Body Style | U-panel · 4-panel · circular/tubular · baffle (Q-bag) |
| Liner | Tubular, formed, glued, aluminised or conductive PE liner |
| Anti-Static | Type A · Type B · Type C (conductive, grounded) · Type D (static-dissipative) |
| Fabric & Finish | UV stabilised; coated or uncoated; food-grade; UN option for dangerous goods |
| Printing | Flexo / offset, multi-colour, Pantone-matched, full-panel branding |
Tell us what you fill, how you fill it and how you move it. We engineer the bag — spouts, loops, baffles, liner and treatment — to that exact job, as standard or fully bespoke OEM/ODM under NDA.
U-Panel FIBC Bag
One U-shaped side panel plus two narrow side panels creates an economical FIBC bulk bag for general dry bulk goods, with safe working loads up to 1,500 kg.
Type A & B
Standard FIBC Bag
Type A: no static protection, for general non-flammable goods. Type B (<6 kV) blocks brush discharge in flammable dusts without solvent vapors.
Circular / Tubular FIBC Bag
A seamless woven body reduces seam stress points, delivering maximum strength for heavy-duty lifting and demanding bulk applications.
Type C & D
Anti-Static FIBC Bags
Grounded Type C and static-dissipative Type D FIBC bulk bags protect against electrostatic discharges in flammable dust and solvent-exposed powder handling.
4-Panel FIBC Bag
(with Baffle / Q-Bag Option)
Four-panel rectangular bags stack and palletize neatly. Add internal baffles to keep a square filled shape and save warehouse space.
Food-Grade & UN Bag
Clean-room produced for food ingredients, or UN-certifiable for regulated dangerous goods.
From farm silos to mine sites, our jumbo bags move tonnes of material safely. A few of the sectors we serve:
Grain, corn, rice, soybeans and seed in breathable or ventilated builds that cut the number of bags per harvest.
BRC food-grade bags for sugar, flour, starch and salt — clean interiors, liners and full traceability.
High-capacity bags with optional waterproof liners to protect moisture-sensitive feed and fertiliser.
Cement, sand, gravel and dry mortar lifted by forklift or crane on reinforced corner loops.
Powders, resins and pigments with liners and conductive Type C / D options for electrostatic safety.
Ore, mineral powder and concentrates in reinforced builds for heavy loads and long-haul transport.
We engineer containers for one-tonne loads, not 25 kg sacks — so lifting loops, seams and SWL are the heart of every design.
Loops, seams and fabric are tested to the rated safety factor, with anti-static and food-grade options engineered in, not added on.
Spouts, baffles, liners, loop layout and treatment are matched to your filler, product and handling method — standard or fully bespoke.
Shipped to 70+ countries with FOB / CIF / CFR / EXW terms, full export documents and a responsive multilingual sales team.
A Flexible Intermediate Bulk Container — also called a jumbo bag, big bag or ton bag — is a large woven polypropylene container with lifting loops, used to store and transport 500 kg to 2 000 kg of dry flowable material.
SWL (safe working load) is the maximum load the bag is designed to hold. We build to a 5:1 safety factor for single-trip bags and 6:1 for reusable bags, meaning the bag is tested to five or six times its SWL.
For flammable dusts or solvent-exposed powders, choose a conductive Type C bag (with grounding) or a static-dissipative Type D bag. Type A is for non-flammable, non-sensitive environments only.
Yes. Our food-grade line runs under BRC with cleaning and traceability; we also produce UN-certifiable bags for regulated dangerous goods. Tell us your application and we'll specify the right build.
Standard designs usually ship within 20–40 days; lead time depends on customization and volume. MOQs are flexible thanks to 20 in-house lines — contact us with your quantity for a firm quote.
Yes. We manufacture to your drawing, sample or specification — size, SWL, loops, spouts, baffles, liner, printing and branding — under NDA with artwork support and a no-resale guarantee on your design.
Whether you're sourcing standard FIBC bags or developing a custom bulk packaging solution, we're here to help. Share your requirements with us, and our team will recommend the right bag design, provide a competitive quote, and support you throughout the entire process—from sampling to production and delivery.
We will contact you within 1 working day, please pay attention to the email with the suffix “@hcstgroup.com“.
