Buying packaging on the spot market – order when you need it, take the best price available – is the default for a lot of operations and it is genuinely the right answer for some of them. The question is not really about price.
What spot buying gets right
No commitment, no forecasting risk, and a real price each time. If your consumption is irregular and your specification is generic, there is little to gain from a contract and a fair amount to lose.
It also keeps you honest on price. A contract signed in one market can be above the market a year later, and a spot buyer never has that problem.
What it costs, which is not price
Priority. When a factory is busy, contract customers get production slots and spot buyers wait. In a normal market that costs a fortnight; in a tight one it costs a month or more, and a month is often the difference between meeting a programme and not.
Consistency, too. A spot buy is whatever is available, and across several spot buys you may get several slightly different products. For a returnable system where parts have to interchange, that is a real problem.
Where contract clearly wins
Anything with tooling – the supplier needs the commitment to justify the asset. Anything where consistency matters across years. Anything where a stockout stops your operation rather than inconveniencing it.
And anything where the specification is specific enough that switching suppliers is not trivial. The harder you are to replace, the more you want the relationship formalised.
Where spot clearly wins
Commodity items with many sources. Slow-moving lines. Anything where you might change the specification. And genuinely unpredictable demand, where a commitment is a gamble dressed as a plan.
The sensible split
Contract the items that stop you if they are missing, and whose specification is stable. Spot-buy the rest. That is what most mature operations do, and it captures most of the benefit of both.
Whatever you do, know your exposure: for each line, how long to source elsewhere if your supplier lets you down. That number is the real measure of whether your buying strategy is safe.
How to write a commitment you can actually keep
Commit to a range rather than a number, if the supplier will accept it. A band – between X and Y per year – is more honest than a point forecast and much easier to defend internally when volumes move.
Where a single number is required, commit to the pessimistic end and treat the upside as optional. A contract you comfortably exceed is a contract that gets renewed on good terms; one you miss is a negotiation you will lose.
And what to do about resin
Any contract longer than a few months has to address resin movement somehow – fixed for the term, index-linked, or reviewable on notice. Ask which, in writing, before signing, and ask for notice period and any cap on a single adjustment.
A fixed price with no stated validity period is not a fixed price. That single line is the most common gap in packaging contracts and it is worth reading twice.
What we can do
We supply PP corrugated sheet on contract or spot and will tell you which makes sense for your pattern. Tell us what happens to your operation if a delivery is late, and we will tell you which lines are worth contracting.