Bulk Bags and FIBC’s 2017-08-03T10:04:18+00:00

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Bulk Bags and FIBC’s available from the UK’s leading packaging supplier 

We provide our customers with expert advice on all styles, designs and options of bulk bags.

With over 20 years experience our website is packed full of useful information to assist you in determining the right bag for your product.

If you need something more bespoke or custom made our expert and friendly team are here to help.

Please call or email and we’ll provide you with the most economical and cost effective solution for transporting your bulk products.

Things to consider when looking to use bulk bags:

They can be manufactured to many different designs and specifications to adhere with the filling, storage, transport and discharge of your products.

Critical factors to consider when deciding on the right bulk packaging for your product are:

  • The weight and volume of product that you wish to carry.
  • The type of filling and discharging mechanism required for the product being carried.
  • The environment in which the product is being filled or discharged, particularly if there is a risk of electrostatic discharge.
  • How will the material flow?
  • Will the bulk bag be filled several times?
  • How is the bag to be lifted?
  • Does the bulk bag need to be produced from a coated fabric to prevent product seepage or water ingress through the fabric?
  • Does the bag require sift proofing to prevent product seepage through the seams?
  • Is the product being carried classified as a dangerous or hazardous material?
  • Is the product being carried a food stuff?

 What is a bulk bag and how is it made?

Here’s a practical guide to the different types of bags available, how they are constructed and helpful information when deciding which is the best one for you.

The name bulk bag refers to an FIBC or flexible intermediate bulk container and they are an ideal way to transport, store dry free flowing materials safely and securely in a very cost effective way.

How much weight can a bulk bag carry?

Bulk bags can be certified to carry product weighing anything from 50kg up to 2000kg, the heavier the product being carried the heavier the grade of fabric required to manufacture the bag to conform to the safe working load. A bag can carry up to 1000 times its own weight.

The bulk bags are predominantly made from PP (polypropylene) a high strength thermoplastic that is very strong yet flexible.

The PP is extruded in tubular form which is then sliced into threads which are woven together (warp and weft) to form a very strong and durable fabric.

Extruded and Woven Polypropylene for Bulk Bags (FIBCs)

From this fabric, the body of the bulk bag is produced

The bag fabrics are produced in different thicknesses depending on the weight the bag is required to safely carry. A fabric required to carry a weight of 2000kg will be heavier and stronger than a fabric required to carry 500kg. Fabric weights are measured in grams per square meter of fabric and typically body fabric for the bag’s will range from 130gsm up to 250gsm.

Contact Dapak for your Bulk Bags

Need more information about Bulk Bags?

Why not ask us about:

  • The right type of bulk packaging for your product
  • Different filling and discharging systems
  • FREE printing and design service
  • FREE no obligation quotations

For expert advice call us on 01335 344215

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There are several ways to produce the body of a bulk bag

U+2 Panel Bulk Bags

U+2 Panel Bulk Bags

This type of Bag construction involves using a single piece of fabric to form 2 sides and the base of the bag in a U shape. The two remaining sides are then sewn on to the U to form the Bag body.

Four Panel Bulk Bags

Four Panel Bulk Bags

As the name suggests this type of Bulk Bag body is produced from 4 separate body panels that are individually sewn to each other. The base and top are then attached. This type of Bag tends to hold its shape batter and is more stable when stacking.

Circular Bulk Bags

Circular Woven Bulk Bags

The fabric is produced in a tubular manner which is left uncut to form the body of the Bulk Bag. The base and top are then sewn on to the tubular fabric. The benefit of this type of production is that there is no sewing required to form the bag sides producing essentially a stronger and more cost effective bag. The downside to a circular woven Bag is that the sides of the bag tend to bow in a circular manner meaning the bags can overhang pallets and produce inefficiencies in transport costs.

How many times can I use a bulk bag?

Custom Bulk Bags

They can be made for either single trip use or multi-trip use and this information is displayed on the safety label attached to the bag.

A safety factor of 5:1 indicates that the bulk bag is for single trip use (the bag can be filled only once but lifted several times on its journey).

A safety factor of 6:1 indicates the bulk bag is for multi-trip use and can be emptied and refilled several times.

The safety label will also display the safe working load that the bag can carry for e.g. 1000kg. It will display details of the test house, certificate number and certificate date together with the bag manufacture date and batch number. All this information demonstrates the bag is tested to perform to a safety standard as well as providing full manufacture traceability about the production of the bulk bag.

What is the best way to fill bulk bags?

Filling Options

Open Top Bulk Bag

Open Top Bulk Bags

The most basic form for filling is a fully open top which is ideal for products like sand and aggregate where the product can flow easily into the bag and it does not need to be protected from the elements.

Top Filling Spout Bulk Bags

Top Filling Spout Bulk Bags

Bulk bags can have a filling spout that can be attached and tied to a machine or hopper feeder pipe, this allows the product to be filled directly into the bag and tied off once complete. The benefit of this method is that there is no spillage during filling and transport, your product is protected from the elements, contamination and dust.

Skirt / Duffle Top Bulk Bags

Skirt / Duffle Top Bulk Bags

Skirt or duffle tops are an ideal way to fill bulk bags from a free flowing conveyor feed. The bag is effectively fully open on the top allowing maximum opportunity for materials to free fall and fill the bag. The skirt is made from a lighter grade fabric to the main body of the bulk packaging and can be easily drawn together and bunch tied to stop the product from spilling during transportation and also to protect it from the elements and contamination.

How do you empty or discharge a bulk bag?

They can be designed with many different apertures to safely discharge the product being carried or stored from the bag.

Flat Base Bulk Bag

Flat Base Bulk Bags

Plain base with no method for discharge.

Base Discharge Spout Bulk Bag

Base Discharge Sprout Bulk Bags

The most common way to empty a bulk bag is through a discharge spout. These spouts are folded (swan necked) and tied so they effectively form a flat base when not in use however when emptying the contents of the bag the spout can be untied and extended to allow the product to flow safely out of the bag. By adjusting the tie on the spout you can determine the radius of the discharge spout which will allow you to effectively control the flow rate of product being discharged.

Full Base Discharge Bulk Bag

Full Base Discharge Bulk Bags

Bulk bags can be designed with a full base discharge with four panels of material sewn into each side of the bag that cross over to form a flat base within the bag. The bag will also have an outer flap that can be securely tied. When untying the base outer flap, the four inner overlapped panels release to form a full base discharge.

Bulk Bag lifting mechanisms

They can have a variety of mechanisms to safely lift the bag, the main types being:

Corner Loop Bulk Bags

Corner Loop Bulk Bags

The most common lifting mechanism is by 4 corner loops that protrude from the top of the Bulk Bag. These corner loops are sewn into and down the four corner seams of the bag.

Cross Corner Loops Bulk Bag

Cross Corner Loops Bulk Bags

Generally used for circular woven bags these loops are sewn across the four corners. Another benefit of this type of loop is that it stands more proud and open making it easier to access with forks.

Lift Loop Extensions Bulk Bags

Lift Loop Extensions Bags

Loop extensions can be attached to a Bulk Bags lifting loops when the filling or discharging equipment requires and different length loop.

Stevadore Strap Bulk Bags

Stevadore Strap Bulk Bags

Stevedore straps can be used when lifting a bag with single forks or cranes.

Other types of specialist Bulk Bags include:

Food Grade Bulk Bags

Food Grade Bulk Bags

For more details about Food Grade Bulk Bags

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Q-Bag / Baffle Bulk Bag

Q-Bag / Baffle Bulk Bags

For details about Q-Bags / Baffle Bags

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Type “A” Bulk Bags

Type “A” Bulk Bags

Find out more about Type A Bulk Bags

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Type “B” Bulk Bags

Type “B” Bulk Bags

Learn more about Type B Bulk Bags

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Type “C” Bulk Bags

Type “C” Bulk Bags

Read more about Type C Bulk Bags

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Type “D” Bulk Bags

Type “D” Bulk Bags

Find out more about Type D Bulk Bags

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Safety starts here: WARNING! never stand under a bulk bag when discharging!

For useful information about custom made Bulk Bags, our knowledgeable staff are here to help with expert advice.


For all your bulk packaging needs get in touch with us today
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