What Are the 5 Most Common Types of FIBC Bags?

Understanding FIBC Types

A flexible intermediate bulk container (FIBC) is an industrial container made of flexible fabric designed for storing and transporting dry, flowable products. Also known as bulk bags, big bags, or bulk containers, these versatile FIBC bags offer numerous benefits in terms of storage, transportation, and handling of bulk materials across the packaging industry.

However, it is crucial to understand that not all FIBC products are created equal. Different types of FIBC bags exist, each designed to meet specific requirements, weight capacity demands, and unique material handling challenges.

Keep reading to learn the differences between the five types of FIBC bags and which type may be best suited to your bulk packaging needs.

Top 5 Different Types of FIBC Bags

1. U-Panel Bulk Bags

U-panel FIBC bags are constructed with three main body components: one piece that runs the full length of the bag forming the bottom and two sides (the “U”) and two additional pieces of fabric sewn between the “U” on two sides (the “panels”). This construction meets common FIBC bulk bag specifications for load stability and material handling efficiency.

Generally, U-panel bags will maintain a square shape when filled, especially with the addition of internal baffles. U-panel bags are an industry standard and the most popular type of FIBC construction, widely used across the bulk packaging industry for their reliable weight capacity and cost-effective design.

2. Circular Bulk Bags

Circular bags, also called tubular bags, are constructed with two main body components: the body tube and the base. 

The body tube is made with seamless tubular fabric that forms all sides of the bag, allowing for stitching only at the top and base of the bag. Although the fabric is tubular, when filled, a circular bag will still somewhat resemble a square bag. 

There is a common misconception about circular bags regarding their shape when filled. They are not truly circular — they are simply constructed with a single piece of fabric that forms all four sides of the bag. While they still resemble square or rectangular FIBCs when filled, they will hold that shape the least out of all the construction types. 

3. 4-Panel Bulk Bags

A very common bulk bag style, 4-panel bags are constructed with five main body components: four side panels and the base. 

When filled, a 4-panel bag will hold its square shape similar to other construction types. Typically, 4-panel bags will hold their shape better than U-panel bags, while U-panel bags will hold their shape better than circular bags. 

Due to the large amount of stitching required, a 4-panel bag has a greater opportunity to fail at the seams and is prone to sifting. Nevertheless, 4-panel bags are ideal for storage due to the way they hold their shape when filled.

4. Baffled Bulk Bags

Baffles are an internal component that can be added to a U-panel, 4-panel, or circular-style bag. More specifically, baffles are fabric panels or strings sewn inside each of a bulk bag’s four corners that allow it to maintain a square shape when filled. 

Without baffles, the construction types listed above can bulge or belly at the sides when filled. 

Also called Q bags, baffled bags are ideal due to their stability and stackability. They also improve overall storage capacity. The most common type of baffled bag is a 4-panel baffled bag. 

5. Single Loop and Double Loop Bags

Produced from single tubular fabric, single and double-loop bags are widely accepted as being more cost-effective than traditional four-loop bags. 

The body fabric of the bag itself is extended into a lifting loop which gives the bag a higher breaking strength and makes the FIBC easier to lift. The loops can be wrapped with colored sleeves to assist in easily identifying the bag. 

An inner liner is usually incorporated inside the bag to keep the packed product free from moisture and other contaminants. 

FIBC Features That Affect Performance and Safety

In addition to the construction styles discussed above, there are other characteristics of flexible container bags that impact their function and application.

Top Style

One such characteristic is top style. Determining the appropriate top style for your bulk bag depends on various factors, including the nature of your material, the handling process, and your specific requirements. The different FIBC top styles are: 

• Open top: An open top bulk bag is a less frequently used top style in which there is no closure mechanism. This means that materials are directly loaded into the FIBC without any cover, leaving them exposed to the elements after filling.
• Spout top: A spout top bulk bag features a narrow cylindrical tube that is sewn onto a flat base. This flat base is then stitched into the body of the FIBC, creating a top panel that can be completely sealed.
• Duffle top: A duffle top, a standard feature of bulk bags, incorporates a spacious tubular skirt that is directly sewn into the upper section of the bag.

Understanding these differences can contribute to more efficient and effective material handling processes.

Coated vs Uncoated

Coated bags work best for moisture-sensitive or dusty materials; uncoated bags suit dry, non-dusty products where cost efficiency matters more than added barrier protection.

Choose a coated bulk bag when:

• Your material is moisture-sensitive or prone to leakage
• Your product generates significant dust that needs to stay contained

Choose an uncoated bulk bag when:

• Your material doesn't require added moisture or dust protection
• Cost-efficiency is the priority

Also confirm compatibility with your filling and discharge equipment, and check any industry-specific regulations, before finalizing your choice.

Lift Loops

Lift loops are the load-bearing handles on a bulk bag, built from durable woven poly rated for the tensile demands of lifting and transporting loaded FIBCs. The two most common types are cross corner and corner seam loops:

• Cross corner loops: Sewn onto the bag body to form an arched structure over each corner; most common on circular bulk bag constructions.
• Corner seam loops: Sewn along the side seams, forming a teardrop shape; typically found on U-panel and 4-panel bulk bags.

Static Protection

The bulk bag classifications below refer to different levels of protection against electrostatic discharge (ESD) risks:

• Type A: Type A FIBC bags offer no protection against static electricity and should not be used for flammable or combustible materials.
• Type B: Type B FIBC bags  can prevent the buildup of static charges on the bag's surface, but they are not intended for use with flammable or combustible materials.
• Type C: Type C FIBC bags , also known as conductive bulk bags, provide a pathway for static electricity to safely dissipate through grounding. 
• Type D: Type D FIBC bags, also referred to as static dissipative bulk bags, are made from specialized materials designed to prevent the accumulation of static electricity.
  
  

Frequently Asked Questions

What does FIBC stand for?

FIBC stands for Flexible Intermediate Bulk Container – this is the full form of FIBC used throughout the packaging industry. A FIBC bag is a type of industrial-grade bulk container made from flexible woven polypropylene fabric, designed for storing and transporting dry, flowable products. FIBC bags are also commonly known as bulk bags or big bags, and typically feature a weight capacity ranging from 2,000 to 4,400 lbs depending on their specifications and safety factor rating.

What is an FIBC bag?

An FIBC is an industrial strength bag. It offers flexibility, sturdiness and numerous benefits in terms of storage, transportation, and handling of bulk materials. In addition, they come in different styles and types including U-panel, Circular, 4-panel, Baffled, and Single Loop and Double Loop bags, each designed to meet specific requirements and address unique challenges.

What are the different types of FIBC bags?

The most common types of FIBC bags are U-panel, circular, 4-panel, baffled, and single/double loop bags. Each construction type offers different benefits for shape retention, strength, and cost-effectiveness.

What is the difference between Type A, B, C, and D FIBC bags?

These types refer to the electrostatic properties of the bag. Type A offers no static protection. Type B is made from materials that prevent sparks. Type C is conductive and must be grounded. Type D is anti-static and dissipates charge without needing to be grounded.

What is the standard size of a FIBC bag?

There is no single standard size. FIBC bulk bags are highly customizable, but common base dimensions are 35" x 35" and 37" x 37", with heights ranging from 30" to 80".

What is the Safe Working Load (SWL) of FIBC?

The Safe Working Load (SWL) is the maximum weight a bag is rated to carry safely. Common SWLs range from 2,000 lbs to 4,000 lbs. All FIBCs are required to have a safety factor, typically 5:1 for single-use bags and 6:1 for multi-use bags, meaning they are tested to withstand 5 or 6 times their SWL.

Which Type of Bulk Bag Is Right for You?

When it comes to bulk material handling, understanding the various types of FIBC packaging is critical. 

Southern Packaging, LP stocks the largest inventory of on-demand FIBCs in the country. We can help you choose the right bulk bag type for your business, ensuring that your packaging solutions align with your specific requirements and industry regulations.

For more information about our FIBC stock or to request a quote, contact a member of our team today.