Measure the details that affect fit
Record the overall dimensions and any shoulders, necks, lids or tapered sections. Give the weight of the item and show where it can safely be supported. A snug opening at the widest point can still leave a narrow base free to move, so a simple rectangle may not describe the whole requirement.
If several products share an insert, send a labelled arrangement and the quantity of each item. Include access for lifting products out without pulling on a cap or fragile decoration.

