Types of 4-Loop FIBC Bags: Choosing the Right Bulk Packaging Solution

FIBC Bags Introduction

4-Loop FIBC Bags—also known as Four-Loop Bulk Bags or Jumbo Bags—are the most common and versatile type of flexible bulk containers used in industrial packaging.
Each bag is designed with four strong lifting loops that allow easy handling by forklifts or cranes.
However, not all 4-loop bulk bags are the same. Their top and bottom designs vary according to the filling and discharge needs of different industries.

In this guide, we’ll walk you through the main types of 4-loop FIBC bags, their unique structures, and how to select the right one for your materials.

1️⃣ Open Top & Flat Bottom FIBC Bags

The simplest and most cost-effective design.
It features an open top for quick loading and a flat bottom for stable stacking.

Best for:
Sand, gravel, plastic pellets, and general industrial use.

Advantages:

• Easy to fill and store
• Economical option for non-dusty materials
• Excellent stacking stability

2️⃣ Open Top with Discharge Spout

This bag combines a standard open top with a bottom discharge spout, making unloading faster and cleaner.

Best for:
Cement, fertilizers, resins, and powders.

Advantages:

• Controlled material release
• Reduces waste and contamination
• Reusable design for multiple loads

3️⃣ Duffel (Skirt) Top & Flat Bottom

A duffel-top bag has a large skirt opening that can be tied after filling, providing better sealing and dust control.

Best for:
Agricultural products, wood pellets, biomass, and grains.

Advantages:

• Wide opening for easy filling
• Protects material from moisture and dust
• Stackable flat base for warehouse storage

4️⃣ Duffel Top with Discharge Spout

This type combines both filling and discharge efficiency—a full duffel top for easy loading and a spout bottom for controlled unloading.

Best for:
Powders, food ingredients, and chemical granules.

Advantages:

• Full control during filling and discharge
• Ideal for reusable and closed-loop systems
• Compatible with liner bags for moisture-sensitive materials

5️⃣ Top Spout & Flat Bottom

Designed with a cylindrical filling spout at the top and a flat bottom, this bag ensures clean and dust-free filling.

Best for:
Fine powders or flowable materials like flour and starch.

Advantages:

• Cleaner filling process
• Prevents dust emission
• Perfect for automated filling stations

This fully spouted design supports both sealed filling and discharge, ideal for high-value powders and chemicals.

Best for:
Pharmaceuticals, fine chemicals, and mineral powders.

Advantages:

• Hygienic and sealed handling
• Reusable and easy to empty completely
• Reduces material loss

A duffel-top FIBC with an inner PE liner provides additional moisture protection.

Best for:
Food-grade or hygroscopic materials (sugar, salt, starch).

Advantages:

• Extra barrier against humidity
• Complies with food safety standards
• Recyclable and reusable

This upgraded model has a reinforced bottom panel for heavy or abrasive materials.

Best for:
Metal scraps, construction waste, heavy minerals.

Advantages:

• Extra strength and durability
• Extended lifespan in tough environments
• Safe stacking for transport

Designed with breathable woven panels, ventilated bags prevent moisture accumulation and spoilage.

Best for:
Agricultural products such as potatoes, onions, and firewood.

Advantages:

• Allows air circulation
• Prevents mold and condensation
• Lightweight and cost-effective

Every 4-loop FIBC bags is engineered for a specific purpose.
By understanding the differences in top and bottom designs, you can choose the right packaging that ensures safety, efficiency, and cost savings.View customization options for APEXFIBC

At ApexFIBC, we manufacture all types of 4-loop jumbo bags using high-strength, UV-stabilized polypropylene fabric, ensuring reliability for your global logistics needs.