Quantity and remaining capacity
Maximum quantity is the largest supported arrangement that fits. Remaining capacity compares that maximum with the current quantity.
Free flexible packaging calculator
Bag Size Calculator
Match a rectangular product to a flat flexible bag, calculate the maximum feasible quantity, and review bag usage, packed weight, payload usage, and remaining capacity. The calculator uses the same Bag Selection engine as KolliPack.
No account required
Shared engineering engine
Bag orientation preview
PDF report
Flat bag interpretation
Length carries the sealing allowance. Width is the bag opening direction.
Interactive calculator
Calculate product-to-bag fit
Enter product and flat bag dimensions in millimetres. Add weights and payload when you want a complete packed-weight check.
One shared implementation. This public page, standalone Bag Selection, Packaging Flow, and applicable multi-product calculations use the authoritative KolliPack bag logic and rendering path.
Calculator outputs
Understand capacity, usage, and weight
The result separates geometric bag fit from optional weight and payload checks so each restriction stays visible.
Current and maximum bag usage
Usage compares required flat area with selected bag area for the current quantity and for the calculated maximum quantity.
Weight and payload
Product weight drives net weight. Packaging tare adds total weight, while maximum payload enables payload usage.
How to use it
Three steps to evaluate a bag
Measure the product
Use the rectangular external length, width, and height of the product or grouped base unit.
Enter the flat bag
Use physical bag length and width. Add product weight, bag tare, and maximum payload when available.
Run and review
Check fit, quantity, usage, weights, payload, orientation graphic, assumptions, and the downloadable shared PDF report.
Engineering restrictions
What the result assumes
The calculator models rectangular bounding geometry and supported deterministic arrangements. It does not infer film stretch, gussets, valves, compression, or irregular product deformation.
Length, sealing, and tolerance
Bag length includes the reserved sealing allowance and tolerance. Bag width is the opening direction and receives tolerance only.
Payload is a separate constraint
A geometric fit can still be unsuitable if net product weight exceeds the real bag's payload, seal strength, or handling limit.
Validate the physical pack
Confirm the selected material, closure, protection, handling, quality, and production process with an actual packaging trial.
Frequently asked questions
Bag size calculator FAQ
How does the bag size calculator determine the required bag size?
It evaluates supported product arrangements with the shared KolliPack Bag Selection engine, then applies the current fit tolerance and reserves sealing space along bag length.
Which bag dimensions should I enter?
Enter the flat bag length and width in millimetres. Bag length includes the reserved sealing allowance; bag width is the opening span and receives the fit tolerance defined by the engine.
What does bag usage mean?
Bag usage compares the calculated required flat bag area with the selected bag area for the current or maximum feasible quantity.
Does the calculator check payload?
Yes. When product weight and maximum payload are supplied, the result shows net product weight, total weight, payload usage, and remaining quantity capacity.
Does this result replace a packaging trial?
No. Flexible materials, seals, product shape, handling, protection, and manufacturing tolerances should still be validated with the actual bag and product.
Continue your packaging analysis in KolliPack
Use catalogue-based Bag Selection and Packaging Flow, compare pallet patterns with the Palletization Calculator, or explore practical packaging articles.