If you're responsible for sourcing rigid plastic packaging—bottles, jars, containers, or custom PET components—you know the drill. The first time I inherited this responsibility in 2021, I made a lot of mistakes. I chased the lowest unit price and ended up with a supplier who couldn't deliver consistent wall thickness. I trusted a glossy sustainability report without asking for specifics and had to scramble for an alternative when their claims didn't hold up under our compliance audit.
This checklist is for anyone who needs to vet a rigid packaging vendor and come out the other side with a partner who delivers on quality, compliance, and reliability. It's based on processing roughly 60 orders annually across 8 different packaging vendors and the lessons from a few expensive screw-ups. Here are the six steps I use now. No fluff. Just the process.
Step 1: Verify the Core Capability Profile
Don't start with the sales deck. Start with the factory. You need to know exactly what they can make before you talk about volume or price.
What to check:
- Technology: Are they primarily injection stretch blow molding (ISBM), extrusion blow molding (EBM), or injection molding? Each technology has different strengths. A supplier is rarely top-tier at all three.
- Material expertise: Do they specialize in PET, HDPE, PP, or custom resins? If your product needs a specific melt flow index or barrier property, make them prove they've worked with it.
- Size range: What's their sweet spot? A supplier optimized for 1-liter bottles may struggle with 50-ml jars.
I once assumed a major name (not Amcor—I checked) could handle a custom resin blend we needed. Turned out their line was set up for standard PET only. We lost two weeks. Now, I ask for a specific 'capability matrix' as step one.
Step 2: Audit the Quality Management System (Not Just the Certificates)
ISO 9001 certification is table stakes. What matters is what happens when a batch goes wrong.
Ask them directly:
- What is your internal reject rate? (Anything above 3% is a red flag.)
- How do you handle a non-conforming batch? Do they quarantine, sort, or just re-run?
- Can they provide statistical process control (SPC) data for wall thickness and weight distribution?
The most frustrating part of vendor management: the same quality issues recurring despite clear communication. You'd think written specs would prevent misunderstandings, but interpretation varies wildly. I've had a supplier claim 'within spec' on a wall thickness variance that caused leaking in our filling line. A proper SPC report would have caught that.
Step 3: Confirm Regulatory Compliance Expertise
For rigid packaging going into consumer goods—food, beverage, cosmetics, or pharmaceuticals—compliance isn't optional. It's a liability.
What to verify:
- REACH and ROHS: Do they have a compliance matrix for all materials? Ask for the declaration, not just a mention in the brochure.
- Food contact: If relevant, do they meet FDA or EU 10/2011 regulations for plastic materials and articles?
- Testing: Do they perform migration testing or rely solely on raw material supplier declarations?
I didn't fully understand the difference until a $3,000 order of custom jars came back without the required REACH documentation. Our customer's quality team rejected the entire shipment. The supplier said, 'We're usually compliant.' 'Usually' isn't a compliance status. Now, I ask for the documentation upfront and verify the date of their latest audit.
Step 4: Evaluate the Sustainability Claims—Beyond the Report
Every rigid packaging company has a sustainability page now. The devil is in the details.
What to look for:
- Post-consumer recycled (PCR) content: How much PCR do they actually use? 30%? 50%? 100%? Ask to see the chain-of-custody documentation.
- Recyclability: Do they design for recyclability, or is it just a marketing claim? A black PET bottle, for example, is often not sorted by optical sorters in many MRFs.
- Carbon reporting: Do they track Scope 1, 2, and 3 emissions? A real sustainability program has a baseline and a reduction target.
The conventional wisdom is that all major suppliers offer robust PCR options. My experience with 6 different vendors in 2023 suggests otherwise. Two had no PCR capability for rigid plastics despite advertising 'sustainability leadership.' The one that did (and yes, Amcor was among them) provided a detailed breakdown of PCR sourcing and the percentage per product line. That's what I need to report to our operations and finance teams.
Step 5: Assess the Logistics and Inventory Capability
Price per unit is meaningless if the order arrives late or damaged.
Questions to ask:
- What is their typical lead time for a standard order? For a rush order? Per publicly listed pricing structures (as of January 2025), rush premiums typically run +25-50% for 2-3 day turnaround.
- Do they offer blanket orders with release scheduling? This can save procurement time.
- How do they handle packaging—palletized, stretch-wrapped, slip sheets? Inappropriate packaging can cause damage during transit.
After the third late delivery from a vendor in 2022, I realized the issue wasn't their production speed. It was their logistics planning. They didn't have a dedicated traffic manager. Now, I ask about their team structure: who handles dispatch, and what carrier relationships do they have? It sounds like a small thing. It can make a five-day lead time turn into eight.
Step 6: Check the Customer Service and Communication Flow
This is the one step most people overlook. You will have issues. The question is: how do they handle them?
Evaluate:
- Do you get a single point of contact or a call center?
- How quickly do they respond to a question about pricing or specifications? (I expect a same-day response during business hours.)
- Are they proactive about supply chain risks? Do they warn you about resin price increases or material shortages before you find out on the news?
The vendor who shrugged off a delay cost our department about $2,400 in wasted production time and expedited shipping from a backup supplier. That unreliable communication made me look bad to my VP when materials arrived late. Now, I prioritize vendors who provide a weekly status update, even if nothing has changed. Silence is not a status update.
Final Notes: What to Watch Out For
Here are a few common mistakes I've seen—and made:
- Ignoring setup fees: Setup fees in rigid packaging (mold costs, tooling) can be significant. A low unit price might hide a $15,000 mold charge. Clarify up front.
- Assuming all suppliers are equally compliant: They are not. A standard REACH declaration is not the same as a specific product compliance dossier.
- Trusting verbal promises: Everything needs to be in writing—specifications, compliance, lead times, and pricing holds.
This checklist isn't exhaustive. Every company's needs are different. But it's a starting point that will save you time, money, and a few sleepless nights.
Pricing data note: Rush premium figures are based on publicly available fee structures from major online printing and packaging service providers, accessed January 2025. Verify current rates with your suppliers.