4 Loop Bulk Bags, also known as 4 Loop FIBC Bags, 4 Loop Jumbo Bags, or 4 Loop Big Bags, are flexible intermediate bulk containers designed for the storage, transportation, and handling of dry bulk materials.
Made primarily from woven polypropylene (PP) fabric, 4 loop bulk bags feature four lifting loops positioned around the top of the bag. This lifting configuration provides convenient handling with suitable forklifts, cranes, and other bulk material handling equipment.
4 loop bulk bags are widely used for fertilizers, chemicals, minerals, construction materials, agricultural products, feed ingredients, and industrial powders and granules.
What Is a 4 Loop Bulk Bag?
A 4 Loop Bulk Bag is an FIBC bag equipped with four lifting loops for lifting and transportation.
The four loops are generally positioned at the four corners of the bag, allowing the filled bag to be lifted and moved using compatible material handling equipment.
A typical 4 loop FIBC may consist of:
- PP woven fabric body
- Four lifting loops
- Filling inlet
- Discharge outlet
- Optional PE or LLDPE liner
- Optional internal baffles
- Customized printing
- Customized top and bottom construction
The bag structure can be customized according to the product characteristics, filling equipment, discharge method, transportation conditions, and required Safe Working Load.
Key Features of 4 Loop FIBC Bags
| Feature | Description |
|---|---|
| Bag Type | 4 Loop Bulk Bag / 4 Loop FIBC |
| Main Material | PP Woven Fabric |
| Lifting System | Four Corner Lifting Loops |
| Common Capacity | 500–2,000 kg |
| Safety Factor | 5:1 or 6:1 |
| Filling Options | Open Top, Duffle Top, Filling Spout |
| Discharge Options | Flat Bottom, Discharge Spout, Customized Outlet |
| Liner | Optional PE / LLDPE Liner |
| Baffle | Optional Internal Baffles |
| Printing | Customized Printing Available |
| Fabric | Coated or Uncoated PP Woven Fabric |
| Applications | Fertilizer, Chemicals, Minerals, Feed, Construction Materials |
Advantages of 4 Loop Bulk Bags
1. Convenient Lifting and Handling
The four lifting loops provide dedicated lifting points around the bag. This makes 4 loop bulk bags convenient for loading, unloading, warehouse handling, and transportation.
Depending on the bag design and handling system, the loops can be used with suitable lifting equipment such as forklifts, cranes, and other approved lifting systems.
2. High Load Capacity
4 loop FIBC bags can be manufactured for different Safe Working Loads.
Common capacities include:
- 500 kg
- 1,000 kg
- 1,200 kg
- 1,500 kg
- 2,000 kg
The required capacity depends on the product density, bag dimensions, filling method, transportation conditions, and customer requirements.
3. Efficient Storage and Transportation
When empty, FIBC bags can be folded and stored in a relatively small space. Their lightweight construction also reduces the weight of the packaging itself compared with many rigid bulk containers.
When filled, the bags provide an efficient way to package and transport large quantities of dry bulk materials.
4. Flexible Customization
4 loop bulk bags can be customized for different products and handling systems.
Common customization options include:
- Bag dimensions
- Safe Working Load
- Safety factor
- Fabric weight
- Loop design
- Loop length
- Filling inlet
- Discharge outlet
- PE liner
- Internal baffles
- Printing
- Packaging method
5. Suitable for Different Bulk Materials
With the appropriate construction, 4 loop FIBC bags can be used for powders, granules, crystals, and other dry bulk materials.
The final bag design should be selected according to the specific characteristics of the packaged product.
4 Loop Bulk Bag Specifications
| Item | Available Options / Description |
| Bag Type | 4 Loop Bulk Bag / 4 Loop FIBC / Jumbo Bag |
| Main Material | PP Woven Fabric |
| Lifting System | 4 Corner Lifting Loops |
| Safe Working Load (SWL) | Commonly 500–2,000 kg |
| Safety Factor | 5:1 or 6:1 |
| Bag Shape | U-Panel, 4-Panel, or Customized Construction |
| Top Design | Open Top, Duffle Top, Filling Spout |
| Bottom Design | Flat Bottom, Discharge Spout, or Customized |
| PE Liner | Optional PE / LLDPE Inner Liner |
| Baffle | Optional Internal Baffles |
| Fabric | Coated or Uncoated PP Woven Fabric |
| Printing | Customized Logo, Text, and Product Information |
| Color | White or Customized Colors |
| Packaging | Bale Packing, Pallet Packing, or Customized |
| Customization | Size, Capacity, Loop Length, Inlet, Outlet, Liner, Printing, etc. |
4 Loop Bulk Bag Construction
A typical 4 loop FIBC consists of several main components.
PP Woven Fabric
The main body is manufactured from woven polypropylene fabric. The fabric specification can be selected according to the required load capacity and application.
Four Lifting Loops
Four lifting loops are positioned around the upper part of the bag. Their dimensions, length, construction, and attachment method can be customized according to the lifting requirements.
Filling Inlet
The top of the bag can be designed according to the filling equipment and product characteristics.
Common options include:
- Open top
- Duffle top
- Filling spout
- Customized inlet
Discharge Outlet
The bottom configuration can be selected according to the unloading method.
Common options include:
- Flat bottom
- Standard discharge spout
- Customized discharge outlet
PE / LLDPE Liner
An inner liner can be added when the product requires additional protection from moisture, contamination, or contact with the external environment.
Internal Baffles
Optional internal baffles can help maintain a more stable bag shape after filling and improve the utilization of available storage and transportation space.
4 Loop Bulk Bag with PE Liner
A 4 Loop Bulk Bag with PE liner combines a strong PP woven outer bag with an inner polyethylene liner.
The liner can provide an additional barrier against:
- Moisture
- Dust
- External contamination
- Product leakage
Different liner structures can be selected according to the product and filling requirements.
Common liner options include:
- Loose PE liner
- Form-fit liner
- Heat-sealed liner
- Customized liner thickness
- Customized liner dimensions
For fine powders and moisture-sensitive materials, a suitable PE or LLDPE liner can provide additional product protection.
5:1 and 6:1 Safety Factor
The Safety Factor (SF) is an important specification when selecting a 4 loop FIBC.
Common options include:
5:1 Safety Factor
A 5:1 safety factor is commonly specified for many industrial FIBC applications. The complete bag construction should be designed and tested according to the required working conditions.
6:1 Safety Factor
A 6:1 safety factor can be selected for applications requiring a higher safety margin or specific reuse requirements.
The appropriate safety factor depends on factors such as:
- Safe Working Load
- Lifting method
- Number of uses
- Transportation conditions
- Storage conditions
- Applicable standards
- Product characteristics
Applications of 4 Loop Bulk Bags
4 loop bulk bags are widely used for packaging and transporting different types of dry bulk materials.
| Application | Typical Products |
| Fertilizer Packaging | NPK fertilizer, urea, ammonium sulfate, potassium chloride, granular fertilizers |
| Chemical Packaging | Chemical powders, chemical granules, industrial raw materials, mineral additives |
| Mineral Packaging | Calcium carbonate, silica, kaolin, talc, bentonite, mineral powders |
| Construction Materials | Sand, aggregates, gypsum, mortar raw materials, construction additives |
| Agricultural Products | Seeds, grains, agricultural raw materials, dry bulk products |
| Animal Feed | Feed ingredients, feed additives, grains, protein meals |
| Food Ingredients | Selected dry food ingredients and food-grade bulk materials |
| Industrial Materials | Industrial powders, granules, additives, and other dry bulk materials |
How to Choose the Right 4 Loop Bulk Bag
Before ordering 4 loop bulk bags, several important specifications should be confirmed.
1. Determine the Safe Working Load
First determine the required SWL, such as 500 kg, 1,000 kg, 1,200 kg, 1,500 kg, or 2,000 kg.
2. Confirm Bag Dimensions
Bag dimensions should be selected according to:
- Product volume
- Product density
- Filling equipment
- Warehouse space
- Transportation requirements
- Container loading requirements
3. Select the Filling Design
The filling inlet should match the customer’s filling equipment.
For example, an open top may be suitable for certain manual filling applications, while a filling spout can be used with compatible automated filling systems.
4. Select the Discharge Design
The discharge outlet should be selected according to how the product will be removed from the bag.
A discharge spout can provide more controlled unloading for many bulk materials.
5. Consider a PE Liner
A PE or LLDPE liner may be recommended when the product is:
- Moisture-sensitive
- Fine powder
- Hygroscopic
- Sensitive to contamination
6. Confirm the Lifting Method
The lifting equipment and handling process should be confirmed before finalizing the loop design.
This helps ensure that the four lifting loops are properly matched to the intended handling system.
Customized 4 Loop Bulk Bags
Zhixin Packaging provides customized 4 loop bulk bags for different industrial and commercial applications.
| Customization | Options |
| Bag Size | Customized according to product and equipment |
| Capacity | 500–2,000 kg or customized |
| Safety Factor | 5:1 / 6:1 |
| Fabric | PP Woven, Coated or Uncoated |
| Lifting Loops | Customized Loop Length and Design |
| Top | Open Top / Duffle Top / Filling Spout |
| Bottom | Flat Bottom / Discharge Spout |
| Liner | PE / LLDPE |
| Baffles | Optional |
| Printing | Customized Logo and Product Information |
| Packing | Bale / Pallet / Customized |
For a customized quotation, customers can provide the bag size, SWL, safety factor, product type, filling method, discharge method, liner requirements, printing requirements, and order quantity.
Frequently Asked Questions
What is a 4 Loop Bulk Bag?
A 4 Loop Bulk Bag is an FIBC bag equipped with four lifting loops for handling and transporting dry bulk materials. It is commonly manufactured from woven polypropylene fabric.
What is the capacity of a 4 Loop FIBC?
The capacity depends on the bag design and application. Common capacities range from 500 kg to 2,000 kg, with customized specifications available.
Can a 4 Loop Bulk Bag have a PE liner?
Yes. A PE or LLDPE liner can be added for applications requiring additional moisture resistance, product protection, or contamination control.
What products can be packed in 4 Loop Bulk Bags?
4 loop FIBC bags can be designed for many dry bulk materials, including fertilizers, chemicals, minerals, construction materials, agricultural products, and feed ingredients.
Can 4 Loop FIBC Bags be customized?
Yes. Bag dimensions, capacity, safety factor, fabric specifications, lifting loops, filling and discharge systems, liners, baffles, printing, and packaging can all be customized.
What information is needed for a 4 Loop Bulk Bag quotation?
Typically, the manufacturer will need the bag dimensions, Safe Working Load, safety factor, product type, filling method, discharge method, liner requirements, printing requirements, and order quantity.
Conclusion
4 Loop Bulk Bags are a versatile solution for the storage, transportation, and handling of dry bulk materials. Their four-loop lifting configuration provides convenient handling, while the PP woven construction offers a practical combination of strength, flexibility, and lightweight packaging.
With customizable dimensions, SWL, safety factor, filling inlet, discharge outlet, PE liner, baffles, fabric specifications, and printing, 4 loop FIBC bags can be designed for a wide range of industrial applications.
For bulk fertilizer, chemical, mineral, construction, agricultural, and industrial products, a properly specified 4 Loop Bulk Bag can provide an efficient and reliable bulk packaging solution.