Travel & Luggage calculator
What Compression Bag Size Do I Need?
Use soft-item volume before compression, compressed/original volume ratio, maximum fill fraction to find compression bag capacity.
Enter your measurements
What Compression Bag Size Do I Need uses soft-item volume before compression, compressed/original volume ratio, maximum fill fraction and the other configured measurements to return compression bag capacity with a formula written specifically for this tool.
- Soft-item volume before compression — Required
- Compressed/original volume ratio — Required
- Maximum fill fraction — Required
Compression bag capacity
Enter the measurements above to calculate compression bag capacity.
How the calculation works
V9 calculation: requiredBagVolume=uncompressedVolume×expectedCompressionRatio/bagFillLimit. The result is reported as compression bag capacity.
Worked example
Example: Soft-item volume before compression = 20 L; Compressed/original volume ratio = 0.7; Maximum fill fraction = 50%. Result: Required Bag Volume = 28 L.
Before you decide
The result is only as accurate as the measurements entered. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what compression bag size do i need, the limiting result on this page is compression bag capacity.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Compression Bag Size calculator tell me?
It returns compression bag capacity from the measurements entered on this page. The calculation is specific to compression bag size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for compression bag size?
Measure soft-item volume before compression, compressed/original volume ratio, maximum fill fraction. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the compression bag capacity?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned compression bag capacity while allowing for the clearances, tolerances or ratings shown by its manufacturer.