THE SEAL / SPAN SUPPLY INDEX
Read dimensions
Does a50 L bag label guarantee fit in my50 L bin?
Keep nominal capacity distinct from opening,rim and usable length.
Can24 by27 cm prove that a3 L item fits the zipper bag?
Do not turn flat source dimensions into usable sealed volume.
How do I compare film length without ignoring width?
Use consistent units and retain approximate geometric area as a separate basis.