Types of top of Bulk bag

28/02/2026

When it comes to the global supply chain, the “Top” of your packaging is just as critical as the bottom. In 2026, as industries move toward higher automation and stricter safety standards, choosing the right opening for your Flexible Intermediate Bulk Containers (FIBCs) can drastically improve your filling efficiency and prevent product contamination.

Vietnam has emerged as the premier destination for high-quality, cost-effective industrial packaging. Whether you refer to them as Jumbo Bags, Big Bags, Super Sacks, or Tonne Bags, understanding the various top configurations is the first step toward optimizing your bulk handling.

Table of Contents

Exploring the 4 Most Popular Top Types for Bulk Bags

Selecting the right top design depends on your filling equipment, the nature of your product (dusty, granular, or chunky), and your storage environment.

1. Filling Spout (Spout Top)

The Filling Spout is the industry standard for automated systems. It consists of a cylindrical tube (usually 14 inches in diameter) sewn into the top of the Jumbo Bag.

Best For: Fine powders, chemicals, and food-grade ingredients (flour, sugar).
Key Advantage: It creates a sealed connection with your filling machine, virtually eliminating dust and product loss.
SEO Tip: Often sought by buyers looking for “Dust-proof FIBCs.”

2. Duffle Top (Skirt Top)

A Duffle Top (or Skirt Top) is a lightweight fabric skirt that is sewn to the top edge of the Big Bag. It features a drawstring that allows the bag to be opened to its full width for filling and then tied shut.

Best For: Agricultural products like grains, seeds, or irregularly shaped items.
Key Advantage: It provides the flexibility of an open-top bag while still offering full protection from the elements once tied.

3. Open Top (Plain Top)

As the name suggests, the Open Top has no cover at all. The four walls of the Super Sack simply end at the top.

Best For: Construction materials, minerals, and waste management.
Key Advantage: It is the most economical design and allows for rapid manual filling or use with a shovel.
Note: These are typically not recommended for products that need protection from moisture or contamination.

4. Conical Top

Similar to a conical bottom, the Conical Top tapers toward the center.

Best For: Specialized materials that need to be “heaped” or filled to maximum capacity without spilling over the edges.
Key Advantage: It allows for a higher fill volume while maintaining structural integrity during transport.

Why Source Your FIBCs from Vietnam in 2026?

The Vietnamese packaging industry has invested billions into high-tech manufacturing, making it a global leader for Big Bag exports. Here is why international buyers are shifting their orders to Vietnam:

World-Class Engineering: Factories like NAPCO (Nghe An Packaging Joint Stock Company) utilize Austrian Starlinger technology to ensure that every Tonne Bag has the tensile strength to withstand heavy lifting.
Certified Safety: Vietnam’s top manufacturers hold ISO 22000 and HACCP certifications, ensuring that your Food Grade Jumbo Bags meet the strictest global hygiene standards.
Strategic Logistics: With ports like Hai Phong and Da Nang operating at peak efficiency in 2026, shipping your Bulk Bags to Europe, the US, or Australia is faster and more reliable than ever.
Customization Power: Whether you need a specific spout length for a unique hopper or UV-stabilized fabric for outdoor storage, Vietnamese suppliers offer bespoke designs tailored to your B2B needs.

Boost Your Efficiency with NAPCO

Choosing the right top configuration isn’t just about containment—it’s about the bottom line. Reducing dust, preventing contamination, and speeding up your filling line can save your business thousands of dollars annually.

At vietnamjumbobag.com, we specialize in high-performance FIBCs designed for the modern world. From standard Super Sacks to highly technical UN-rated bags, we provide the quality you need directly from our state-of-the-art facility in Vietnam.

Ready to see the NAPCO difference?

Visit vietnamjumbobag.com to browse our full catalog of laminated solutions or request a direct factory quote for your next order.

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