Sizes, and the pound line
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The range
Fifty milliliters to 950 across 198 containers, which covers a single variety sample, a season’s packet and a bulk jar for a market grower. Jars rather than packets, which is a different product from the paper seed envelope.
The pound line sits inside this range
Whether a filled container is over or under one pound decides whether the germination percentage, the date of test and a lot number have to appear. The same jar is on either side depending on the crop.
Because seed density varies enormously
A jar of lettuce seed and the same jar of beans are not close in weight. There is no volume figure that maps onto the pound line, which is why the answer is a scale rather than a conversion table.
So weigh each crop in each container
Once, at the fill level production will use, and record it against the crop. That table is what tells you which label template a given product needs, and it does not change unless the fill does.
Small jars for high-value varieties
The lower end of the shelf suits a rare or expensive variety sold in small quantity, and it keeps you comfortably under the pound line. Label space is tight, which matters if a "Below Standard" disclosure is needed.
Large jars for bulk, with a lot number
Over a pound the label gains the germination figures and a lot number or other lot identification. That is more printing and it also makes traceability real, which a grower buying in quantity will expect.
Cost the format, not the milliliter
Filling, labeling, sealing and the test apportionment are close to flat per unit, so a small jar carries far more of each per gram of seed. Decide what each format has to earn rather than reading one number across.