Send representative samples, not only nominal dimensions
Nominal drawings do not always show product movement, flexible packs, raised features, sharp edges or the way a filled product behaves during collation and shrinking. Where practical, send representative products, trays or pads and the proposed PE film. Identify the smallest, largest, heaviest, least stable and most heat-sensitive formats so the review covers the difficult cases as well as the normal pack.
The specification checklist, sample-trial and FAT guide and site-preparation guide provide the supporting detail.