Who This Checklist Is For

If you're sourcing rigid plastic packaging for consumer goods — bottles, jars, containers — and you've ever had a production delay or rejected shipment because specs were off, this is for you. I've been in procurement for 7 years, mostly at mid-size CPG brands. In my first two years alone, I personally caused about $8,000 in wasted material and rework fees. Most of it came from things I assumed were "standard."

After the third disaster, I sat down with the process engineers at Amcor — one of the biggest rigid plastics suppliers — and built a pre-order checklist. We now use it for every new packaging SKU. It's not fancy. It catches the stuff that looks fine on a screen but costs you on the floor.

The 5-Step Pre-Order Checklist

Each step has a checkpoint at the end. If you can't check it off, don't hit 'order' yet.

Step 1: Confirm Material Family — Not Just "Plastic"

I once ordered 50,000 units described as "rigid plastic containers." The supplier used polypropylene (PP). My filling line was set up for PET. The containers warped under heat. That order — $3,200 — went straight to scrap.

You'd think "I know my material" but the confusion happens more than you'd expect. Common rigid plastic resins used in packaging:

Checkpoint: You have the exact resin type written on the spec sheet — not just "rigid plastic." For food-contact items, confirm cation resin standards if the resin requires ion-exchange purification during processing (some PET grades do). Ask the supplier for the material data sheet.

Step 2: Verify Physical Dimensions Against Your Line — Not the Catalog

I remember a call in September 2022. Our new bottle design looked perfect on the CAD file. But when the first pallet arrived from Amcor’s rigid plastics plant in Bellevue, Ohio, the neck finish was 0.5mm too wide. It didn’t fit our capping machine. Every bottle — 12,000 units — had to be reworked. That caused a 3-day production delay and cost about $1,100.

The problem? The catalog said "24-410 finish." I assumed that was a standard dimension. It is — but the standard has a tolerance range, and our capping head was at the tighter end. Since then, I always request a pre-production sample and physically test it on our line before approving the full run.

Checkpoint: A pre-production sample (physical, not just a drawing) has been tested on your actual filling/capping equipment. Tolerances are agreed in writing.

Step 3: Understand Your Supplier's Specialization — Ask "What Don't You Do Well?"

This one I learned the hard way twice. A supplier that claims to handle everything — "from bottles to blister packs to injection molded caps" — often does none of it with great depth. I now ask directly: "What type of rigid packaging are you best at, and what should I go elsewhere for?"

When I visited Amcor's rigid plastics facility in Orlando (they do have a plant there, though not all their plants are public), their sales engineer said, "We're really strong in PET and PP stretch-blow molded bottles for food and beverage. If you need multi-layer barrier structures for high-oxygen sensitive products, we can do it, but it's a specialty line with longer lead times." That honesty saved me from a rushed order that would have missed my launch date.

Checkpoint: You've asked the supplier to name their core competency. If they can't, that's a red flag.

Step 4: Factor in Total Cost — Not Just Unit Price

I once switched to a cheaper PET supplier because their per-unit price was 8% lower. But their minimum order quantity was higher, they didn't hold safety stock, and their shipping window was "3-5 business days" (not guaranteed). When our demand spiked, we had to air-freight from a backup supplier — $2,300 extra. Plus I spent three stressful weeks second-guessing the decision.

In the world of rigid plastics, total cost includes:

According to industry benchmarks (and yes, I've seen Amcor's pricing structure as a customer — they're not always the cheapest, but they rarely surprise you with hidden fees), the supplier with the lowest unit cost often ends up costing 15-20% more over a year.

Checkpoint: You've calculated total annual cost for at least three suppliers, not just the unit price.

Step 5: Discuss Quality Assurance — Specifically, Who Inspects What?

Most packaging defects come from in-transit damage, dimensional drift during production, or material contamination. You need a clear agreement on inspection points. For example, cation resin (used in water treatment and some food-contact plastic manufacturing) can leave residues if not properly flushed. Ask your PET supplier — can you provide a certificate of analysis for resin purity per batch?

Also, don't assume the supplier's quality report equals yours. We had a situation where the supplier's QC passed a run, but our inspection caught a hairline crack in the neck finish. The supplier argued it was within their spec — but our spec was tighter. Since then, our purchase orders include: "Final acceptance based on buyer's incoming inspection."

Checkpoint: You have a written quality agreement defining: inspection method (visual, dimensional, leak test), sample size, acceptance criteria, and resolution process for rejected lots.

Common Mistakes I Still See Colleagues Make

Final Thought: The Supplier Who Says "We Can't Do That" Is Worth Keeping

I used to think a good supplier does everything. Now I know better. The sales rep at Amcor who told me, "That type of multi-layer barrier isn't our strength — here's who does it better," earned my trust for all the stuff they are great at. Specialist suppliers who set clear boundaries produce fewer headaches.

If you're starting a rigid plastic packaging project, go through this checklist. It'll save you the $8,000 mistake I made — plus the week of stress that comes with it.

Amcor Technical Desk

The desk prepares packaging, polymer, compliance, and sustainability notes for B2B teams comparing Amcor rigid plastics and related material programs.