Types of discharge of bulk bag 2026 version

Choosing the right discharge method for your Flexible Intermediate Bulk Containers (FIBCs) is just as important as the material you put inside them. Whether you are handling fine powders, reactive chemicals, or agricultural grains, the bottom design of your Big Bag determines the safety, speed, and efficiency of your unloading process.

As a leading global supplier, NAPCO (Nghe An Packaging Joint Stock Company) offers a wide array of customizable discharge options to ensure your operations run smoothly. Here is a guide to the most common discharge types and why sourcing them from Vietnam in 2026 is the smartest move for your business.

Table of Contents

Common Bottom Discharge Types for Jumbo Bags

The discharge design of your Jumbo Bag (also known as a Super Sack or Ton Bag) should be matched to your material’s flow characteristics and your facility’s equipment.

1. Standard Discharge Spout

The most popular choice across industries, the discharge spout is a fabric tube (typically 14″ in diameter) sewn into the bottom of the Big Bag.

Best for: Free-flowing materials like sand, plastic resins, and grains.
Key Advantage: Allows for a controlled, steady flow and can be closed mid-discharge if necessary.

2. Conical Bottom Discharge

For materials that tend to “bridge” or get stuck in the corners, a conical bottom is the ideal solution. The base of the FIBC tapers into a cone shape, directing all content toward the spout.

Best for: Fine powders, flour, or damp materials that don’t flow easily.
Key Advantage: Ensures 100% discharge without the need for manual shaking or vibrating tables.

3. Duffle Bottom (Full Open Bottom)

A duffle bottom features a large opening that spans the entire width of the bag, secured with a tie-string or a “diaper” flap.

Best for: Large, clumpy, or irregularly shaped products like firewood, scrap metal, or wet minerals.
Key Advantage: Provides the fastest possible unloading speed for non-free-flowing materials.

4. Plain Bottom (Flat Bottom)

This is a solid base without a spout. To empty it, the operator usually cuts the bottom of the bag.

Best for: One-time use applications where the bag will be recycled or disposed of after emptying.
Key Advantage: Highly economical and simple, making it a cost-effective choice for construction debris or low-value bulk goods.

5. Iris Closure (Star Closure)

An iris closure is an additional fabric protector that wraps around the discharge spout. It acts like a valve to provide extra security and control.

Best for: Fine chemicals and expensive food ingredients.
Key Advantage: Minimizes dust during discharge and prevents the spout from sagging or accidental opening during transport.

Why Source Custom Discharge FIBCs from NAPCO Vietnam?

In 2026, NAPCO continues to set the benchmark for high-performance packaging. When you order your Bulk Bags from vietnamjumbobag.com, you aren’t just buying a bag; you’re investing in precision engineering.

Precision Manufacturing: Using Austrian Starlinger and Indian Lohia machinery, NAPCO ensures that every spout and closure is sewn with reinforced seams to prevent leaks and blowouts.
Food & Pharma Safety: Our factory is ISO 22000 and HACCP certified. For food-grade Jumbo Bags, we offer discharge spouts with additional “protection flaps” to keep the spout clean and free from contamination during transit.
Extreme Customization: Need a 15-inch spout for a specific hopper? Or a double-layered diaper bottom for extra security? NAPCO’s R&D team works directly with you to design the perfect Big Bag for your facility.
Speedy Global Logistics: Located near major Vietnamese ports, we guarantee delivery of your custom Ton Bags within 3 to 4 weeks—significantly faster than most regional competitors.

Optimize Your Workflow Today

Choosing the wrong discharge type can lead to product waste, safety hazards, and costly downtime. Let the experts at NAPCO help you select the perfect configuration for your material.

Ready to compare quality and pricing?

Request a Direct Quote from NAPCO’s Export Team:

Dien – Export Manager: +84 98 549 5345 (Whatsapp, Wechat, Line, Viber, Kakao talk)
Email: Dien@napco.com.vn
Website: https://vietnamjumbobag.com/