Whether to put all your packaging with one supplier or split it is usually argued on risk and decided on price. Both matter, and the answer is almost never all-or-nothing – it is about which items belong on which side of the line.
What single-sourcing buys
Consistency. One specification, one set of tolerances, one contact. For a returnable system where parts have to fit together across years, that is worth a great deal – mixed suppliers mean mixed tolerances and parts that do not interchange.
Buying power, too. Concentrated volume gets better pricing and better attention when you need something urgently. A supplier with ten per cent of your spend treats a rush order differently from one with all of it.
What multi-sourcing buys
Resilience. A fire, a shipping disruption, a quality problem, a commercial dispute – any of these stops one supplier, and if they are your only source they stop you.
And a benchmark. A second supplier keeps the first honest on price and gives you somewhere to go without starting from zero.
What it costs
Two sets of specification, two qualification processes, two relationships to maintain. Split volume means worse pricing on both. And for anything with tooling, second-sourcing means second tooling – which is expensive enough that it usually settles the question.
The practical split
Single-source the items with tooling, the items that have to fit together, and the high-volume repeat lines where consistency is the point. Multi-source the commodity items – standard sheet, standard boxes – where any supplier will do and switching cost is near zero.
That gives you the resilience where it is cheap and the consistency where it matters, and it is what most operations converge on whether or not they planned it.
Two things to do either way
Keep the specification documented well enough to hand to another supplier without starting over. And know, for each line, how long it would take to source elsewhere. That number is your actual risk exposure, and it is worth writing down.
The specification side is covered in packaging spec sheet terms, translated.
What second-sourcing actually requires
Not just a second supplier, but a second qualified one: dimensional conformance confirmed, a trial order run, documentation on file, terms agreed. Qualifying on paper is fast; qualifying so you can actually order at short notice takes a couple of months and a small trial order.
Do it in calm conditions. Qualifying under pressure – after the incumbent has failed – is slower, more expensive, and you will accept a worse alternative because you need one.
How much volume to give the second source
Enough to keep them interested and competent: some operations run a tenth, some a third. Below a certain share a second supplier will not prioritise you and the qualification quietly expires – they change a tool, a grade or a process and your alternative is no longer qualified.
A nominal order every few months, even a small one, keeps the qualification alive. It costs a little and it is the difference between having a second source and having a phone number.
What we can do
We supply PP corrugated sheet and will quote as primary or second source. Tell us which role you need us in – we would rather be a qualified second source than pretend to be your only one.