U-Panel
A continuous panel forms the bottom and two opposite sides, with separate panels completing the body. Review dimensions, seams, and lifting requirements together.
Custom FIBC configurationsFIBC Constructions
FIBC Constructions
and Design
Your product. Your process.
A bag built around both.
From body construction to the last closure detail, the right FIBC starts with how your operation works. Review bag shape, filling, lifting, product protection, and discharge in one complete specification.
FIBC constructions • Custom configurations • Specification review
Start with the structureThe shape of the bag.
The shape of the bag.
The needs of your operation.
Body construction is one part of the finished design. Bring fill weight, product behaviour, equipment, and footprint into the same discussion.
Circular / Tubular
Fabric woven as a tube forms the body without vertical side seams. Explore nominal 35 × 35, 36 × 36, and 39 × 39 inch footprints in our capacity calculator. Top, bottom, and lifting components complete the finished construction.
Four-Panel
Four individual side panels form the body. Specify the finished dimensions and construction details against your filling and handling process.
Baffle
Internal corner panels help the filled bag retain a more square profile. Review product flow, liner compatibility, and the intended pallet or shipping footprint.
Match your equipmentFill with purpose.
Fill with purpose.
Discharge with a plan.
Define opening sizes, closure details, and equipment interfaces around the product and your operating procedures.
Open top
A full-width opening provides access for filling. Define how the product will be contained and protected after filling.
Duffle / Skirt top
An extended fabric top opens for filling and gathers for closure. Include your closure method and product protection requirements.
Filling spout
Match spout diameter, length, ties, and any liner extension to your filling head and operating procedure.
Flat / Closed bottom
A closed base suits applications without a discharge spout. Discuss the intended unloading method before selecting the construction.
Discharge spout / Bottom chute
Specify diameter, length, closure, and equipment interface around the product’s flow and required discharge rate. Include a bottom protection flap if needed.
Full-opening discharge
A larger bottom opening may be considered where the process calls for it. Review support equipment and the complete discharge arrangement.
Remote discharge / Side release
Discuss access to the closure and a release arrangement suited to your discharge station and operating procedure.
Flow control
Share the required discharge rate, product flow characteristics, and receiving equipment so flow-control features can be reviewed.
Complete the configurationSmall details.
Small details.
A complete bag design.
Specify the components that connect the bag to your handling process and product protection requirements.
Body fabric
Discuss coated or uncoated woven polypropylene, breathable or ventilated construction, fabric weight, colour, and exposure conditions. Match the fabric to the complete design and intended load.
Seams & containment
Specify sift-resistant seams and dust-containment needs using your product’s particle size and handling conditions. Review the proposed construction and liner together.
Liner shape & material
Explore tubular, form-fit, and form-fit baffle liners. Share polyethylene, foil barrier, moisture, oxygen, and other material requirements for review.
Liner attachment & supply
Discuss inserted, sewn-in, glued-in, or tabbed attachment. Include any requirements for replacement liners or liners supplied on rolls.
Identification & printing
Include stencilling, print artwork, labels, lot identification, and document pouches. Identify sides, print colours, and required information.
Special application requirements
Include food contact, Type C, CROHMIQ Type D, or UN HazMat needs at the outset. Construction options must be reviewed with the relevant material documentation and design qualification.
Connect the bag to your equipmentLifting options.
Lifting options.
Designed into the bag.
Share the actual equipment and intended lifting method so the arrangement can be specified with the complete construction.
Four-corner & cross-corner loops
Specify loop arrangement, free height, width, and equipment clearance. Review all lifting points as part of the approved bag design.
Stevedore straps
Discuss a strap arrangement for centre pick-up where required by your lifting equipment. Confirm the lifting method against the design and its instructions.
Full-length lift sleeves
Share fork dimensions, spacing, and insertion requirements to review sleeves with your handling equipment.
Stand-up & colour-coded loops
Discuss loops that help present the lifting points and colour identification for your operation. Define the arrangement in the bag drawing.
Size for the complete journeyThe right capacity.
The right capacity.
The right fit.
Empty dimensions are a starting point. Review the filled bag with your product, equipment, and shipping layout.
Footprint & shipping layout
Start with pallet dimensions and usable truck, container, or rail space. Confirm filled bag dimensions, clearances, and loading requirements for your route.
Fill weight & capacity
Provide target net weight and bulk density. Review volume, settled shape, fabric, seams, loops, and the specified safe working load together.
Height & equipment clearance
Include filling head height, lifting clearance, discharge station dimensions, and storage restrictions when choosing the bag height.
Baffle & liner compatibility
Review how internal baffles and any liner affect filling, product movement, discharge, and the bag’s filled profile.
Sizing guidelines: All sizes and capacities shown—including published U-panel and baffle designs and circular estimates—are guidelines only. Bulk-Pack can help you determine the right bag size and design for your product, equipment, and handling requirements.
Fabric stretch & sizing estimates: Fabric stretch varies by manufacturer, fabric construction, elongation, load, product characteristics, filling conditions, and other factors. Actual filled dimensions, shape, and usable capacity may differ from chart values and calculated estimates. Confirm the final design, dimensions, capacity, and safe working load with Bulk-Pack and the manufacturer.
The Bulk-Pack differencePractical experience.
Practical experience.
From concept to specification.
Our 45+ years of FIBC manufacturing and sales experience help turn operating requirements into a clear bag specification.
Start with your product’s bulk density, particle size, flow characteristics, fill temperature, and target weight. Add filling equipment, lifting method, storage, discharge, delivery timing, and any food contact, electrostatic, or hazardous materials requirements.
Knowledge for your operationUnderstand the options.
Understand the options.
Define the requirements.
Use these industry references to prepare for a design discussion.
FIBC Design Guide
Work through the questions behind a complete bulk bag specification.
FIBCA Design Guide ↗FIBC terminology
Review the terms used for bag components and construction features.
FIBCA Terminology ↗Other FIBC requirements
Explore food contact, electrostatic, and UN HazMat product pages.
Explore FIBC Product Types ↗Common questionsBetter details.
Better details.
Better design discussions.
How do we determine the right bag size?
Start with target fill weight and product bulk density, then review filling behaviour, settled dimensions, handling clearances, and pallet or transport limits. Confirm the proposed dimensions through the specification and application review.
Is a baffle bag a separate electrostatic type?
Baffle describes the internal construction. Electrostatic classification is a separate requirement that must be specified with the complete bag and liner design.
Does coated fabric replace a liner?
Coating and liners serve different construction and containment needs. Share the particle size, moisture sensitivity, barrier requirements, and contact conditions so the appropriate combination can be reviewed.
Can we change the filling or discharge spout?
Share your equipment dimensions and proposed change. Review spouts, closures, liners, and any qualification requirements before changing an approved specification.
Can the bag include food contact or UN HazMat requirements?
Include these requirements at the start of the review. They require product-specific documentation and, where applicable, qualification beyond the bag’s shape and openings.
Can you work from an existing bag or drawing?
Yes. Send your drawing or current specification, photos, product information, target fill weight, and details of filling, lifting, storage, and discharge.
Let’s talk packagingLet’s design the bag
Let’s design the bag
around your operation.
Share your product, bulk density, target fill weight, dimensions, filling and discharge equipment, liner requirements, and quantity. Include your drawing or current specification.