01
The top
The duffle sleeve connects to a fixed filling head, keeping filling contained and dust inside the bag. Once filled, the sleeve ties shut for a clean closed top.
Classic Structure
StandardDuffle Top / Discharge Spout FIBC
Duffle top · Discharge spout
Classic Structure
What is this structure
This structure pairs the contained filling of a duffle top with a discharge spout at the bottom. The duffle sleeve fills through a fixed filling head with dust kept inside the bag, and the spout empties the product in a controlled flow into the receiving point below. It is the fully contained option — clean at both ends — and suits fine powders that need low dust during loading and controlled, repeatable unloading.
Key Features
- Duffle sleeve fills through a fixed filling head
- Contained at both ends — low dust loading and unloading
- Bottom spout for controlled, repeatable discharge
- Flow starts and stops by untying and re-tying
- Size, load, fabric, sleeve, spout and liner customizable
- The fully contained classic structure
02
The bottom
The discharge spout unties to release the product in a controlled flow into a hopper, screw conveyor or process line, and re-ties to stop it. Repeated, dust-controlled discharge without manual tipping.
03
Suitable Materials
Fine powders that demand clean loading and controlled unloading — chemical powders, cement, flour, food powders and similar. Dust containment matters at both filling and discharge, which this structure addresses at both ends.
Handling Advantages
How it loads, discharges and travels
Loading
Filling through the duffle sleeve from a fixed filling head keeps dust inside the bag and the filling area cleaner than an open top.
Discharge
The bottom spout ties off for clean, controlled discharge into hoppers and conveyors. Flow starts and stops by untying and re-tying, which suits repeated emptying and reduces residual material and dust.
Transport & Storage
A closed duffle top keeps the filled bag tidy in transit, and the spout-centred base still palletises. For very high stacking, a flat bottom stacks slightly squarer, but this structure handles normal palletised transport and storage well.
Duffle Top / Discharge Spout FIBC
Typical Specification
- SWL
- 500–2000 kg (confirmed against your material)
- Safety Factor
- Typical 5:1
- Size
- Customized to material, container and stack height
- Fabric
- Customized per application (typically 140–200 gsm)
- Top
- Duffle top (sleeve diameter/length customizable)
- Bottom
- Discharge spout (length/diameter customizable)
- Lifting
- 4 loop / 2 loop / customized
- Liner
- Optional; recommended for fine powders or moisture-sensitive materials
- Printing
- Custom printing available
Important Note
The specifications shown are typical configurations. Final specifications should be confirmed according to the packed material, bulk density, filling method, handling method and transportation conditions.
Material Guide
Materials this structure can carry
Six practical examples selected around the bag opening, discharge method and common African mining, construction, agricultural and industrial supply chains.
Cement Powder
The closable duffle sleeve supports flexible filling, while the bottom spout directs cement into a receiving hopper with less uncontrolled release.
Fertilizer Granules
Granular fertilizer can be filled through a tolerant wide sleeve and metered from the bottom into blending or field equipment.
Raw Sugar
The tied sleeve encloses raw sugar during transport and the centered outlet supports cleaner transfer into processing bins.
Maize Grain
A wide top speeds grain filling and the bottom spout supports repeatable discharge into storage or milling equipment.
Solar Salt Crystals
Coarse salt crystals flow readily through the outlet, while the tied duffle top encloses the load during storage and transport.
Gypsum Powder
The sleeve accommodates varied filling heads and the bottom outlet gives gypsum processors a defined discharge path.
A duffled top for clean, low-dust filling and a bottom spout for controlled discharge.