Working the table backwards
On this page11
The instinct is to pick the bottle first
Because the bottle is the product you are buying and the label feels like something that gets designed later. For a regulated product that order is backwards.
Count the required text first
Signal word, statement of hazard, precautionary measures, first aid where required, the name and place of business, net contents. All of it has to fit.
Set it at the height the table demands
For the panel size you are considering. Then measure the block it occupies, as printed, rather than as it appears on a screen.
Then look at your panel
A cylindrical bottle gives you a wrap, and the usable panel is the straight wall times the circumference you can print without the label lifting at the seam.
Straight walls give the most
45 HDPE packers and 43 PE cylinder rounds on this shelf. A straight cylinder is the most label-efficient shape there is.
Tapers and ovals give less than they look
18 PE imperial bullet cosmos here. Attractive, and the usable panel is smaller than the surface area, which is the trap.
Watch the band boundaries
If your panel lands at 5.2 square inches you are in the band above 5, needing a 3/32 inch signal word rather than 1/16. A slightly smaller panel can mean a smaller legal minimum.
Which is a genuinely counterintuitive result
Going down a size class can reduce the required type height, though it also reduces the space you have. Both move together and the arithmetic has to be done.
A carton is the escape
If the bottle cannot carry it, an outer carton with a larger panel can, and that is a normal answer rather than a defeat.
Do it once per product, not per print run
The panel, the band and the heights are fixed as soon as the container is. Writing them down once stops the question being re-litigated by whoever is doing the artwork this time.