Pack integrity and the missing count
Updated
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Static scatters small parts
Dry plated parts in a plastic jar pick up charge during filling and climb the wall. Pieces end up on the land of the finish, the closure traps them, and the customer finds flattened parts and a count that looks short. Glass does not solve it and slowing the fill does.
Jump rings foul the thread
A jump ring is the worst shape for a continuous thread finish. It sits in the thread groove, the cap goes on crooked, and the pack either leaks parts in transit or will not reseal at the bench. This is the main argument for a dome lid or a lug finish at the tiny end.
Nesting hides a count
Bead caps and dome shaped findings nest. Fifty nested caps occupy the volume of twenty, and a customer who counts by eye concludes the pack is short. A fill line printed on the label is worse than useless for a nesting part.
Chain scrap is sold by weight and bought by length
Scrap and offcut chain is priced per ounce and used per inch, and the relationship between the two depends on the gauge and the link style. A pack that states only a weight generates a question on every order.
Wire gauge is a measurement, not a part
It appears in this group because people search for it, and a pack cannot contain it. If a listing promises a gauge it has to state the standard, because American Wire Gauge and the millimeter sizes used for jewelry wire are not the same scale and the numbers run backward.
Post earrings add a sharps problem
Loose posts in a jar puncture a liner, catch on a glove and come out of a poly bag. A card or a foam insert inside the jar is the usual answer, and it changes the fill volume you need.
The common thread
Every one of these is cheaper to fix in the container choice than in customer service, and all of them get blamed on the fill operator first.