Minimum Order Quantity (MOQ): 1 pallet (typically 125–250+ bulk bags)
To specify an open top on an FIBC purchase order, clearly state that the bag requires a full open top with no filling spout or integrated top closure, then document the rest of the FIBC construction separately—including body style, bottom design, Safe Working Load, safety factor, lift loops, fabric, coating, liner requirements, dimensions, and any application-specific requirements.
Sounds easy, right?
Write “open top” on the purchase order and move on.
Not so fast.
“Open top” tells the supplier one important thing about the FIBC.
It does not tell them what the rest of the bag needs to be.
And this is where purchasing teams get into trouble.
A buyer sends an old PO.
The description says something like:
“Bulk bag, white, open top.”
Great.
What Safe Working Load?
What body construction?
What bottom?
What loops?
Coated or uncoated?
Lined or unlined?
What product is going inside?
How is it being filled?
How is it being emptied?
Now everybody starts making assumptions.
And assumptions are exactly what you do not want when ordering industrial packaging.
Open top means the upper portion of the FIBC remains open rather than using a filling spout or integrated duffle-style closure.
The product is loaded directly through the large opening.
That makes open top construction useful for coarse, bulky, irregular, and other materials where unrestricted filling access is valuable.
But remember:
Open top is only the top construction.
You still need to define the rest of the FIBC.
Think of it like ordering a truck and writing:
“Four doors.”
Useful information.
Not enough information.
Keep the wording simple and unambiguous.
A practical description could state:
Top Construction: Full Open Top — No Filling Spout / No Duffle Closure
That tells the supplier exactly what you are trying to accomplish.
You want the entire upper opening available for filling.
You do not want a filling spout.
You do not want an integrated duffle closure.
Then move on to the other specifications.
Do not try to cram the entire FIBC construction into the phrase “open top.”
Because dozens of other variables determine how the bag performs.
Two FIBCs can both be open top and be completely different bags.
One might be designed for a relatively lightweight product.
Another might carry a dense industrial material.
One might have a flat bottom.
Another might have a discharge spout.
One might use circular construction.
Another might use four-panel construction.
One might be coated.
Another might be uncoated.
One might contain a liner.
Another might have no liner at all.
Both are technically open top.
That is why purchase-order descriptions need structure.
At minimum, buyers should think through:
| Specification | What You Need to Define |
|---|---|
| 📦 Top | Full open top |
| 🏗️ Body construction | Circular, U-panel, four-panel, baffle, etc. |
| ⬇️ Bottom | Flat bottom, discharge spout, or other design |
| ⚖️ SWL | Required Safe Working Load |
| 🛡️ Safety factor | Appropriate classification for intended use |
| 🪢 Lift loops | Style, configuration, and required dimensions |
| 🧵 Fabric | Appropriate woven polypropylene construction |
| 💧 Coating | Coated or uncoated |
| 🛍️ Liner | Lined or unlined |
| 📐 Bag size | Required finished dimensions/tolerances |
| 🏷️ Labeling | Required identification or printing |
| 📦 Packing | Required pallet/bale/packing configuration |
| ⚙️ Application | Product and handling requirements |
That is a much more useful purchase order.
Terminology should reduce confusion.
If you require the entire upper section of the FIBC to remain open, say so.
Full Open Top
Then clarify:
No Filling Spout
No Duffle Closure
Why repeat yourself?
Because a few extra words on a purchase order are cheap.
Receiving thousands of incorrectly constructed bags is not.
Procurement documentation should eliminate interpretation wherever practical.
If you truly want an open top, the answer is generally no integrated closure.
But verify that first.
Does somebody cover the bag after filling?
Does the product sit in storage?
Does the product travel nationwide?
Does dust or debris need to stay out?
Does rain exposure occur?
Does the customer expect the contents to arrive covered?
If employees fill an open top FIBC and immediately install a separate cover every single time, ask whether a duffle top or another closure configuration would make more operational sense.
The PO should reflect what the process actually needs.
Call or Text us at 832.400.1394
After the top, define the body.
Common FIBC body constructions include circular or tubular, U-panel, four-panel, and baffle designs.
These constructions can affect how the FIBC fills and maintains its shape.
Do not assume “open top” implies a particular body style.
It does not.
If body construction matters, put it on the purchase order.
If you are replacing an existing bag that performs well, verify the construction from the actual specification rather than guessing from appearance.
This is a big one.
What happens when the customer wants the product out?
A flat-bottom FIBC behaves completely differently from a bag with a discharge spout.
You could therefore have:
Full Open Top / Flat Bottom
or
Full Open Top / Discharge Spout Bottom
Both are legitimate FIBC configurations.
They serve different processes.
The top tells you how product enters.
The bottom tells you how product leaves.
Specify both.
Safe Working Load, or SWL, is one of the most important specifications on the purchase order.
It defines the maximum load the FIBC is designed and rated to carry under its specified conditions of use.
Do not write:
“Heavy duty.”
That is vague.
Do not write:
“Strong bag.”
Also vague.
Specify the required SWL.
And make sure the requirement is based on the actual product weight.
Safety factor is part of the FIBC design and testing classification.
The appropriate safety factor depends on the intended use of the bag.
It should not be treated as extra payload capacity.
If an FIBC has a specified Safe Working Load, the operator should remain within that limit.
Do not use safety factor as permission to overload the bag.
The purchase order should state the required classification when applicable so there is no ambiguity about the intended bag design.
This one gets missed constantly.
Bulk density tells you how much a given volume of product weighs.
Why does that matter?
Because FIBCs have both physical volume and weight limitations.
A dense product may reach the Safe Working Load while the bag still appears partially empty.
A lightweight product may fill the available volume before approaching the SWL.
If you are designing or changing the FIBC, provide the product bulk density.
It helps determine whether the requested bag geometry makes sense.
Do not make the supplier guess.
Tell them what is going inside.
Sand?
Plastic pellets?
Recycling material?
Agricultural material?
Powder?
Mineral?
Manufacturing scrap?
The actual product can influence fabric, coating, liner, static-control requirements, filling configuration, and other design decisions.
If the product is proprietary, you may still be able to provide relevant handling characteristics.
Particle size.
Bulk density.
Flowability.
Moisture sensitivity.
Abrasion.
Dust generation.
Those characteristics are useful.
Weight alone does not tell you how aggressive the product is against the bag.
A relatively light material with sharp edges may be more demanding on the fabric than a heavier smooth product.
If the contents are abrasive, jagged, or capable of puncturing woven polypropylene, that information belongs in the specification process.
Open top bags are commonly chosen because irregular material is easier to load through the large opening.
That same irregular material may also be harder on the bag.
Do not solve the filling problem and ignore the structural problem.
Open top FIBCs can use coated or uncoated woven polypropylene.
The choice depends on the product and process.
Uncoated fabric allows more air movement through the woven structure.
Coated fabric provides greater fine-particle containment and resistance to moisture moving through the fabric.
But remember:
A coated open top bag still has an open top.
Do not specify coated fabric and assume the entire FIBC is suddenly waterproof.
The complete construction determines product protection.
If the FIBC requires an internal liner, put that on the purchase order.
Do not assume “open top” means unlined.
Open top bags can be used with liners in appropriate applications.
But then you need more information.
What liner material?
What liner style?
Loose insertion?
Form fit?
Attached?
How will the liner remain positioned during filling?
How will the liner be closed?
Does it need to provide a moisture barrier?
Does it need to help contain fine particles?
The more important the liner becomes, the more detailed the specification should become.
This is especially important with an open top.
The outer FIBC may be completely open while the internal liner has its own opening and closure.
That means the liner can effectively become the primary product-containment layer.
If that is what you want, document it.
Do not simply write:
“Open top with liner.”
That leaves too much unanswered.
Define how the liner is expected to function.
The lifting loops are structural components.
Specify the required configuration.
Corner-seam loops?
Cross-corner loops?
Another engineered lifting arrangement?
The correct design depends on the FIBC body construction and handling equipment.
If the current bags work well with your forklift or filling frame, document the existing loop arrangement before changing suppliers.
Do not let loop configuration change accidentally because nobody put it on the purchase order.
Loop length can influence how easily forklift operators engage the bag and how well the FIBC works with filling or discharge equipment.
If your operation requires a particular loop geometry, document it.
Better yet, provide the handling requirements behind the number.
What forklift is used?
How are the forks spaced?
Are the loops attached to a filling frame?
Is the FIBC suspended over discharge equipment?
That context can prevent a dimension from being copied blindly into future orders after the process changes.
Dimensions should be documented consistently.
Use the agreed measurement convention.
Do not assume every person reading the PO interprets the dimension order the same way.
Also understand that FIBC dimensions are not the same as guaranteed filled dimensions.
Flexible packaging changes shape.
The product’s bulk density, flow characteristics, body construction, and filling method all influence the filled profile.
If pallet fit is critical, communicate that requirement.
Flexible woven packaging is manufactured to tolerances.
If a dimension is critical to your filling equipment, pallet configuration, warehouse system, or discharge station, identify it.
A dimension that is merely convenient should not necessarily receive the same attention as one that determines whether the bag physically fits the equipment.
This is another reason buyers should explain the application.
A supplier needs to know which measurements are operationally critical.
If you need a flat bottom, say it.
If you need a discharge spout, specify it.
If you need another engineered discharge design, document it.
Do not assume the supplier will duplicate the previous order forever.
Purchase orders should be capable of standing on their own.
Someone reviewing the document years later should understand what was ordered.
An open top FIBC can still have a discharge spout bottom.
If so, define the outlet and closure requirements.
Think about the receiving equipment.
How does the material leave the FIBC?
Does the outlet connect to a hopper?
Conveyor?
Feeder?
Mixer?
Does the product bridge?
Is partial discharge required?
Again, the top and bottom are separate systems.
Specify both.
Call or Text us at 832.400.1394
If the FIBC requires printing, identification, lot information, warnings, handling instructions, or other markings, put them on the specification.
Do not rely on an old email attachment floating around somebody’s inbox.
Control the artwork or label requirement.
Use revision numbers when appropriate.
The goal is traceability.
A buyer should be able to look at the purchase order and know exactly which approved configuration is being requested.
If your company buys bulk bags repeatedly, assign the approved configuration an internal item number.
That number should connect to a controlled specification.
Now instead of purchasing:
“White open top bulk bag”
you purchase:
FIBC Item ABC-123 — Rev. C
Much better.
The item number becomes the shortcut.
The specification behind it contains the detail.
This becomes increasingly valuable when your facility uses multiple similar FIBCs.
Specifications change.
Maybe the loop length changes.
Maybe the fabric changes.
Maybe a liner gets added.
Maybe the bottom changes from flat to discharge spout.
If you do not control revisions, somebody eventually orders the wrong version.
Use revision numbers or dates.
And make sure the purchase order references the correct revision.
This is basic procurement discipline that can prevent extremely expensive mistakes.
“Same as last time” is dangerous.
Maybe the previous PO was incomplete too.
Maybe the supplier filled in missing information from internal records.
Maybe the person who knew the application left the company.
Maybe the original drawing changed.
Maybe you switch suppliers.
Now the tribal knowledge disappears.
A good specification should survive personnel changes.
Write down what the bag actually is.
Open top construction may be simpler than other top configurations.
But that does not mean you should automatically select it to reduce price.
If the product needs containment, you may end up adding separate covers.
Now you have another component.
Another inventory item.
Another labor step.
Another possible failure point.
Saving a little on the bag can cost much more downstream.
Choose the top based on process requirements first.
Then optimize cost.
A structured PO description might look conceptually like this:
FIBC — Full Open Top / No Filling Spout / No Duffle Closure / [Body Construction] / [Bottom Construction] / [Required SWL] / [Required Safety Factor] / [Lift Loop Configuration] / [Coated or Uncoated] / [Liner Requirement] / [Approved Specification Revision]
Notice what this does.
It separates the major features.
Someone can scan the description quickly.
And the detailed controlled specification can contain the exact engineering requirements.
That is far better than a paragraph full of vague packaging language.
For a straightforward application, the specification structure could be:
Top: Full open top, no integrated closure
Body: Approved FIBC body construction
Bottom: Flat bottom
SWL: Per approved application requirement
Safety Factor: Per intended-use requirement
Lift Loops: Approved loop configuration
Fabric: Woven polypropylene
Coating: As required by product
Liner: None unless specified
Printing: Per approved artwork
Application: Approved dry bulk product
Specification: Current approved revision
The point is not to copy those exact choices.
The point is to organize the information so nothing important disappears.
Another configuration might be structured as:
Top: Full open top, no filling spout or duffle closure
Body: Approved body construction
Bottom: Discharge spout with approved closure
SWL: Per approved application
Safety Factor: Per intended-use requirement
Lift Loops: Approved configuration
Fabric: Coated or uncoated as specified
Liner: As required
Application: Approved dry bulk material
Specification Revision: Current approved drawing/specification
Now purchasing, receiving, quality, production, and the supplier are all talking about the same bag.
That is the goal.
Before releasing the PO, confirm:
That last question is worth asking on repeat orders too.
Processes change.
Packaging should change with them.
The first mistake is writing only “open top bulk bag.”
Too vague.
Another is assuming open top means flat bottom.
It does not.
Another is forgetting SWL.
Another is leaving out safety factor.
Another is specifying dimensions without identifying the convention.
Another is forgetting the liner.
Another is allowing lift-loop configuration to change unintentionally.
Another is ordering coated fabric because somebody thinks it makes an open top bag waterproof.
It does not.
Another is relying on “same as previous order.”
And the biggest mistake is letting critical specifications live in somebody’s memory instead of a controlled document.
Purchasing should not have to engineer the FIBC alone.
Operations knows how the bag is actually used.
Ask them:
How is it filled?
What equipment touches it?
What frustrates operators about the current bag?
How is it moved?
How is it stored?
How is it emptied?
Does material spill?
Does dust escape?
Does the product get wet?
Do loops fit the forklift correctly?
Does the bag fit the pallet?
Does the current top serve any purpose?
Those answers can be more valuable than simply looking at last year’s PO.
Quality may have additional requirements.
Product-contact requirements.
Cleanliness.
Traceability.
Printing.
Lot identification.
Certificates.
Inspection requirements.
Contamination controls.
Approved materials.
Those requirements should be tied to the controlled FIBC specification rather than communicated differently on every order.
Consistency is the point.
Warehouse personnel see problems other departments miss.
They know whether the filled FIBC sits correctly on the pallet.
They know whether loops are easy to access.
They know whether bags bulge into neighboring pallet positions.
They know whether covers fall off.
They know whether open tops collect debris.
They know whether the current bags are annoying.
Ask them.
A five-minute conversation with the forklift operator can prevent a five-figure purchasing mistake.
If you are changing the design, supplier, material, dimensions, liner, or another important feature, samples can be extremely useful.
Do not simply look at the empty sample.
Use it.
Put it on the filling station.
Fill it with the real product where practical.
Lift it.
Move it.
Put it on the pallet.
Store it.
Discharge it.
See what happens.
An empty FIBC lying on a conference-room table tells you almost nothing about how it will behave with a real load.
Treat the first production decision like a process validation.
Confirm the bag matches the drawing.
Confirm the open top provides enough access.
Confirm the material fills correctly.
Confirm the final payload remains within the rated requirements.
Confirm the loops work with handling equipment.
Confirm the filled shape works with pallets and storage.
Confirm the bottom works with discharge.
Confirm any liner behaves correctly.
Then document the approved configuration.
Now future purchase orders can reference something real.
Detailed enough that nobody has to guess.
That does not necessarily mean putting every technical detail directly into the PO description.
A better system may use a concise purchase-order line referencing a controlled technical specification or drawing.
The purchase order identifies the item.
The controlled specification defines the engineering.
The important thing is that the two are clearly connected.
Do not let critical details live only in emails.
Standardization reduces mistakes.
It simplifies purchasing.
It simplifies receiving inspection.
It makes supplier comparisons easier.
It reduces accidental substitutions.
And it makes future optimization easier because you know exactly what the baseline bag is.
If your company buys several open top FIBCs, create controlled specifications for each approved configuration.
Then you can compare actual requirements instead of comparing vague descriptions.
Make sure every supplier is quoting the same specification.
This sounds obvious.
It is not always what happens.
Supplier A may quote coated fabric.
Supplier B may quote uncoated.
Supplier A may include a liner.
Supplier B may not.
Loop configurations may differ.
Body construction may differ.
Bottom design may differ.
Then purchasing sees three prices and assumes they are comparable.
They are not.
Normalize the specification first.
Then compare pricing.
Control the specification.
Reference the correct revision.
Use an internal item number.
Require appropriate documentation.
Inspect incoming product against the approved requirements.
And when something changes, update the specification before the next order.
Do not solve discrepancies through endless email chains after the truck arrives.
Prevent them before production begins.
Once the design has been validated, repeat ordering should become simple.
The PO references the internal item number and current approved specification.
Any changes are clearly identified.
If there are no changes, the supplier produces against the established requirements.
That is much safer than rewriting the bag description from scratch every time.
Consistency is exactly what repeat industrial packaging should provide.
Keep it direct:
Top Construction: Full Open Top — No Filling Spout / No Duffle Closure
Then define the rest of the bag separately.
Body.
Bottom.
Safe Working Load.
Safety factor.
Fabric.
Coating.
Liner.
Lift loops.
Dimensions.
Printing.
Packing.
Product.
Application.
Approved specification revision.
That is the difference between ordering “some bulk bags” and purchasing a controlled industrial packaging component.
The FIBC may look simple.
The purchase order should still be precise.
Because one missing sentence on a PO can become thousands of wrong bags sitting in your warehouse.
Write the requirement once.
Make it clear.
Control the revision.
Test the bag.
Then reorder the exact configuration that works.
That is how FIBC purchasing should operate.
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