Use this checklist when you're vetting an industrial packaging supplier

Every time a procurement team asks me to vet a new packaging source, I use the same list. I'm a quality and compliance manager at an industrial packaging distributor, and I review roughly 200 unique container orders a year—steel drums, plastic drums, IBCs, fiber drums, and corrugated packaging. In 2024, I rejected 6% of first deliveries because of seam defects, print registration issues, or missing certification paperwork. That's not a pleasant way to start a relationship, so I'd rather check everything before placing an order.

Use this when you're evaluating an industrial packaging supplier—whether that's a global Greif company facility, a Greif Packaging LLC location, or a regional broker. If you're exploring Greif packaging jobs, this list also gives you a realistic picture of what the quality side of the role involves.

One note before the steps: this checklist is accurate as of Q1 2025. And I'm not a chemical engineer, so I can't speak to chemical liner compatibility. What I can tell you from a quality review perspective is what a buyer needs to verify before signing a contract.

The 7-point checklist

1. Confirm certificates before you talk price

If a plant can't produce the right certifications, nothing else matters. Ask for current UN/DOT certificates for regulated packaging, ISO 9001:2015 quality systems, and any customer-specific audit reports. Write down the exact marking that should appear on the finished product. Greif company facilities, for example, publish UN markings on drum spec sheets. The salesperson shouldn't have to search for it.

I've seen buyers assume a drum is UN-rated because it's round and made of steel. It's not. Put another way: circular containers are not automatically regulated containers. The UN mark is a performance certification, not a shape.

2. Measure the sample, don't just look at it

Get a physical sample, then get out the calipers. Check wall thickness, overall height, gasket fit, and closure ring alignment. For a steel drum, a few thousandths of an inch in wall thickness can change stacking strength. For a fiber drum, check edge crush resistance and moisture barriers. Most suppliers list nominal dimensions; you're verifying that the real product matches the spec sheet.

Never expected the budget vendor to outperform the premium one on this step. Turns out their process was more disciplined for the standard SKUs that make up our core orders. The lesson: don't rank suppliers on price until you've measured the product.

3. Test the closure with a dry-fit

The closure is where most leaks happen. Take the gasket out and inspect it. Is it a continuous profile with a proper splice, or a molded piece that doesn't sit flat? Dry-fit the lid and tighten the closing ring. The ring should engage evenly around the full circumference.

In March 2023, I rejected a batch of 120 drums because the gasket profile was 2 mm too thin. The vendor called it within industry tolerance. We called it a leak risk. They redid all 120 drums at their cost. Now every contract I touch includes a dry-fit sample requirement.

4. Validate label and print specs before you approve artwork

This is where the phrase 'online business card designer' becomes dangerous. I see a lot of small brands that used an online business card designer to create a label file. A business card is 3.5 x 2 inches; a drum label isn't. The file might look good on screen but fail in production because the bleed, resolution, or color profile is wrong.

Here are the print specs that matter: standard commercial offset printing is 300 DPI at final size. For brand-critical colors, industry-standard color tolerance is Delta E < 2, according to the Pantone Color Matching System. And if you're specifying paper, remember that 80 lb cover is 216 gsm, while 80 lb text is 120 gsm. Mix those up and your packaging insert will feel different from what you approved.

5. Ask what recycled content claims actually mean

Sustainability is table stakes now, but claims need verification. If you're buying corrugated from Greif's containerboard network, ask for the percentage of post-consumer fiber and any chain-of-custody certifications. If the packaging is for a consumer product like a 1 liter reusable water bottle, the printed carton is the first impression, so the color and finish matter as much as the recycled content.

Same rule applies to plastic drums and IBCs: ask whether the resin percentage is verified and whether the printed inks qualify for the recycling stream. If the supplier says sustainable without naming a standard or a test result, flag it.

6. Get MOQ and small-order policy in writing

I've never understood why some suppliers treat a 100-unit trial order as a nuisance. Small doesn't mean unimportant—it means potential. When I needed 50 custom-labeled corrugated boxes for a product test, a Greif Packaging LLC sales rep handled it like a real order, not a favor. That vendor still receives our large orders today. A different supplier wanted a $5,000 minimum and lost the account entirely.

That said, I get why minimums exist: setup, color matching, and line changes make small batches expensive. I just don't think a small buyer should have to apologize for asking. If a supplier's MOQ is too high, ask whether they have a sample tier with standard lead time. Some do.

7. Run a simulated handling test

Don't inspect the sample in a meeting room. Stack it, shake it, push it across a concrete floor. Load it on a pallet and see how it behaves under taping and stretch wrap. For a 1 liter reusable water bottle carton, that means stacking it with six bottles inside on a retail shelf. For a drum, it means a forklift test with the closed drum, not an empty shell.

A defect that shows up in your warehouse will cost more than any rush fee. Total cost of owning a cheap package includes rejects, reprints, shipping delays, and rework. The lowest quote is rarely the lowest total cost.

Mistakes I see on every other order

One is confusing protection claims. If you've ever wondered, 'does electrical tape stop electricity?' the short answer is no—it insulates against unintended contact, but it doesn't stop current in a closed circuit. Packaging has the same limits: water-resistant corrugated isn't waterproof, and a coated fiber drum isn't a chemical containment system. Read the spec sheet, not the marketing words.

Another mistake is treating lead times like guesses. Get a calendar-date commitment, not a vague 4-6 weeks. The value of guaranteed turnaround isn't speed—it's certainty. For event materials, knowing the deadline will be met is often worth more than a lower price with estimated delivery.

Oh, and if someone still uses an online business card designer for a packaging label, don't approve it. Ask a print professional to rebuild the file with the correct die line, bleed, and resolution. It's a small cost compared to a full run of misprinted cartons.