If you're ordering custom printed products from Dart Container or any major supplier, the most expensive button on the page is the 'Submit Order' button—unless you've checked three specific things first.

I learned this the hard way. In my first year handling supplies (2017), I placed what I thought was a straightforward order for custom-printed #10 envelopes with a window. 500 units, one-color logo, nothing fancy. The quote came back at $185—reasonable. I approved it.

What arrived was a box of envelopes with the logo printed upside down. No, wait—the logo was right-side up on the other side of the envelope, but they'd printed on the wrong panel. Ugh, $185 straight to the trash, plus the reorder cost of $198 because I needed it rush (standard was 5 days; I needed it in 3). Total cost: $383 for what should have been $185.

Since then, in about 50 orders across multiple suppliers (including Dart Container's online ordering system at the Waxahachie facility), I've documented 47 significant errors that could have been prevented. This checklist is the result of those mistakes.

The Real Cost of a Careless Order

Let's be specific. Here's what a single error can cost you, based on actual experiences:

• A wrong panel print on 500 envelopes: $185 wasted + $198 reorder + 1-week delay. Total: $383. (This was my 2017 mistake.)
• Choosing the wrong envelope size for a wedding invitation insert: A $320 order where the envelope was 1/4 inch too small. The inserts had to be trimmed, costing an extra $160. (Circa 2019, on a friend's wedding order I handled as a favor.)
• Missing a specific USPS stamp placement requirement for a 'how to place 2 stamps on an envelope' request: The client's order of 600 custom envelopes with a designated spot for two stamps was rejected by their mail house because the stamp placement guide was 1/8th of an inch off. That cost $90 in reprints plus the client's embarrassment. (This happened in early 2022.)

Looking back, each of these was preventable. The problem wasn't the supplier (Dart Container and others are generally reliable). The problem was my pre-submission checklist was incomplete.

Pre-Submission Checklist: The 3 Questions I Ask Every Time

After that third error in Q1 2024—a $250 mistake involving a pastel water bottle label that printed at 90% opacity instead of 100% because I'd uploaded a file with the wrong color profile—I created a hard-copy checklist. Here are the three most important checks:

1. The Layout & Panel Question

Which panel is the print on? This sounds basic, but it's where most of my errors occurred. For envelopes, confirm: is the logo on the front left, back flap, or window side? For containers, is it on the body, lid, or both?

From the outside, it looks like you just upload a file and pick 'front' or 'back.' The reality is that many suppliers' online systems have a default panel assumption that might not match your intent. Dart Container's system, for example, defaults to 'body' for cups, but for some plastic containers, 'lid' is the default if it's a multi-part item. I once ordered 1,000 foam cups with the logo printed on the lid rim area (default) instead of the cup body (where I wanted it). The reorder cost me $320.

2. The Size & Fit Question

Are my dimensions correct for the intended purpose? For that wedding invitation disaster, I assumed a standard #10 envelope could hold a 4.5x6.25 inch insert. It can't—it fits a 4.125x9.5 inch insert. The envelope size is fine; my assumption was wrong.

For containers, check the 'fill volume' vs 'total volume.' Many Dart Container cups list a 16 oz capacity, but that's brim-full. The usable fill line is often 1/2 inch lower. If your label wraps to the fill line, it might be covered by the lid. We caught this on a $3,200 order for a chain of coffee shops in 2023—luckily before production.

3. The Finishing & Regulatory Question

Does my design meet industry or postal standards? This one bit me on the two-stamp envelope job. USPS has specific guidelines for stamp placement and spacing. If you're designing an envelope with a designated space for '2 stamps' (especially for international mail or heavy invitations), you need to follow their template, not your aesthetic judgment.

I've learned that 'standard' and 'custom' have overlaps but also clear boundaries. Most suppliers will gladly print your design, but they won't check for USPS compliance unless you ask. Dart Container's customer service at the Waxahachie location was actually helpful when I called them about it in 2022. They pointed me to a resource I'd missed on their site. To be fair, that info was there; I just didn't look for it.

What Most People Get Wrong About Ordering Custom Packaging

People assume the biggest risk is a spelling error. It's not. That's easy to catch. The biggest risks are:

• Alignment and registration: Your logo prints exactly where you uploaded it, but your design had a 3mm bleed margin that got cropped. (This happened to me on a batch of 250 'pastel water bottle' labels—they printed with a white border on one side because the file's live area was too close to the edge.)
• Color profile mismatch: Your design looks great on an RGB monitor but prints dull in CMYK. The $250 error in Q1 2024 was exactly this.
• Material compatibility: Some inks or adhesives don't work with certain plastics. Dart Container's foam cups require specific inks. If you upload a design meant for paper, it might not adhere properly. The reorder cost me $220 on a project for a catering client in Chicago.

What was best practice in 2020—just upload a high-res PDF and trust the system—may not apply in 2025. Most suppliers now offer pre-flight checks, but they're automated. They check file resolution, color space, and bleed. They don't check your assumptions about panel assignment or USPS rules.

When To Skip My Advice

I should be clear about the limits of this checklist. It's based on my experience with small to medium orders (under 10,000 units) for custom printed products. If you're ordering standard, unbranded containers in bulk—like plain Dart foam cups for a corporate event—this checklist is overkill. You can just order and it'll be fine.

Also, if you're using a full-service print broker who handles the spec review and proofing, a lot of these risks are mitigated. My recommendations are for people who are doing the ordering themselves, directly through a supplier's online portal.

If this seems like a lot of work, I get it. I used to think the same way. But the cost of getting it wrong—$383 wasted on my first mistake—has completely changed my approach. I now maintain a team checklist that we run through for every single custom order. We've caught 47 potential errors in the past 18 months. That's 47 times we saved between $90 and $3,200. It's worth it.

(Prices based on quotes from online printers and Dart Container's current pricing as of January 2025. Verify current rates before ordering.)