Industry Trends

6 Steps to Better Packaging Specs: A Quality Inspector's Field Guide

Who This Is For (And When You'll Need It)

This is for anyone who's ever had to approve a packaging spec and wondered if it'll actually hold up under real conditions. Maybe you're in procurement, maybe you're a production manager, maybe you're a new engineer who just got handed a binder of supplier claims.

I've been on the quality side of this for a while now—reviewing specs for industrial and healthcare packaging before they reach customers. Roughly 200 unique items a year, across Bemis and now under the Amcor umbrella. I've rejected about 15% of first submissions in 2024 due to specs that looked fine on paper but wouldn't survive the line.

This checklist covers the 6 things I check every time. Most of them aren't in the supplier's glossy brochure.

Step 1: Check the Material Cert—Not Just the Claims

First thing I do is pull the material certification. Not the marketing sheet. The actual test data.

I've seen suppliers claim "medical-grade" and then the cert shows a standard commercial film with no biocompatibility data. That's a hard no for healthcare packaging. If you're specifying for a Bemis-type application where sterility matters, you need to see the actual test results—Is the material USP Class VI? Does it pass ISO 10993 for cytotoxicity?

What I look for:

• Material type and thickness (with tolerance range)
• Any relevant regulatory cert numbers
• Date of last test (not just "in compliance")

If the supplier can't produce a cert within 24 hours, that's a red flag. In Q3 2024, we rejected a batch because the cert showed a different material grade than what was delivered. The vendor said it was "an equivalent substitute." We said send the right stuff.

Step 2: Verify the Dimensions Against Your Real Tooling

This one sounds obvious, but you'd be surprised how often it gets skipped. The spec says 12 inches. Your machine might run at 11.95 inches. That .05 inch gap can cause jams or poor seals.

When I first started doing this, I assumed the supplier's drawing was gospel. Then we had a run where 8,000 units got stuck in the forming tool because the material width was off by 2mm. The supplier's drawing said "12.0 inches ± 0.1"—we measured 11.85 consistently.

So now I always:

• Get the supplier's nominal spec AND tolerance
• Measure a sample against your tooling dimensions
• Run a quick fit test on the actual line

Doesn't take long, but it catches maybe one in ten spec submissions that are technically "within spec" but won't work for your machine.

Step 3: Drop-Test for the Worst Case—Not the Ideal

Suppliers love to test under perfect conditions. Pristine box, perfect drop angle, controlled temperature. That's not how packages get handled.

I ran a blind test with our warehouse team a few years back: same product, same packaging, two different sealing methods. Method A passed the supplier's drop test at 99%. Method B passed at 97%. But when we simulated actual handling—throwing it onto a conveyor, stacking it unevenly, storing it at 40°C for a day—Method B had a 14% failure rate.

So for any healthcare or industrial packaging:

• Test at the extremes of your shipping environment
• Simulate real handling, not lab conditions
• If it's for sharps containers or critical medical components, test with the actual contents

I only believed this after ignoring it once. The "cheap" option looked fine on paper. Real-world performance? Not so much.

Step 4: Seal Strength Validation—And Check the Weakening Over Time

Seal strength at time of manufacture is one thing. Seal strength after storage, temperature cycling, and handling is another.

For a medical packaging project we did in 2023, we specified a minimum seal strength of 1.5 N/cm at delivery. The supplier's initial test showed 2.0 N/cm. Great. But after 30 days of storage at 35°C, it dropped to 0.8 N/cm on some samples. That was below our spec.

Now every contract where I'm specifying requirements includes a clause for accelerated aging tests. It adds maybe a week to validation, but it saves you from discovering the problem after 10,000 units are already packed.

What I check:

• Initial seal strength (obvious)
• Seal strength after 30 days at storage temperature
• Visual check for delamination

This isn't my area of expertise—I'm a quality inspector, not a materials scientist—but from a procurement perspective, if the supplier can't provide aging data, that's a risk you're taking on.

Step 5: Check the Labels and Barcodes Against Your System (The Step Most People Miss)

Here's one I see skipped all the time: the label spec. Everyone checks the packaging material, but the labels? They're an afterthought. Until they don't scan, or they fall off, or the ink smears under warehouse conditions.

Had a situation in early 2024 where a supplier changed the label adhesive without telling us. The barcode looked fine, but on the actual product—a tote bag for a medical device—the label peeled off within a week. That caused a recall issue. Not fun.

So I always:

• Test a label sample on the actual surface (not a paper sheet)
• Check barcode readability with your scanner
• Verify the label's temperature range (warehouses aren't climate-controlled)

I'd say one in five spec submissions I review has a label issue. It's not hard to fix—but you have to check it before production, not after.

Step 6: Run a Small-Scale Production Trial (Before You Commit the Big Order)

This is the step that separates theory from practice. No matter how good the spec looks, you don't know how it'll run on your equipment until you run it.

I always request a 100-unit trial run—or whatever is reasonable for your scale. We run it on the actual line, with the actual operators, under actual shift conditions. We note any jams, any tearing, any alignment issues.

The cost of a small trial run is usually under $500 (sometimes much less). A full production run with bad specs? Could be $5,000 or more in wasted material and downtime.

If a supplier pushes back on a trial, that's a red flag. The good ones are happy to do it.

What to Watch Out For (Common Gotchas)

Here are a few things I've learned the hard way:

• Don't trust "within industry standard" without specifics. I've heard this from vendors whose product was clearly off. Push for numbers.
• Specs change over time. A supplier might change their process without telling you. I've seen a material thickness change by 0.02mm—enough to cause problems.
• Your line isn't a lab. What works in controlled conditions might not work at 5 PM on a Friday.

One last thing: if you're dealing with healthcare packaging or sharps containers (like a lot of our Bemis healthcare line), don't skip the regulatory compliance check. It's not my area, so I always loop in our compliance team. But I make sure the spec includes the relevant standards.

This checklist isn't meant to be exhaustive—every product and line is different. But it covers the gaps I saw most often in my first couple years. If you check these 6 things, you'll avoid maybe 80% of the common spec failures.