- Slipping ship dates, rigid ordering terms, a single-source flag or import costs that no longer add up are all reasons to qualify a second carton source.
- A switch usually runs: send what works today, match the structure and board, check samples and proofs, trial on your line, then a first production run.
- Many brands qualify a second source first and move volume once the new cartons have proven themselves on the line.
- Tariff rules changed several times in 2026. A U.S. plant takes the import duty off the finished carton; board and other inputs can still be affected.
- Graph-Pak makes folding cartons in Franklin Park and Island Lake, Illinois, in the Chicago area.
Five signs it's time to qualify a second carton source
- Ship dates have moved more than once on recent orders.
- Your SKU mix changes faster than your current ordering terms allow.
- A risk review flagged packaging as single-sourced.
- Imported cartons no longer pencil out once duty and freight are counted.
- Your line runs one supplier's cartons well, and nobody has tested an alternative.
Buying from a U.S. plant takes the import duty off the finished carton
Tariff status as of October 2026
For cartons made overseas, 2026 added another reason to look. In February the Supreme Court ruled that IEEPA does not authorize the President to impose tariffs, striking down the reciprocal tariffs (DLA Piper). A temporary Section 122 tariff followed and expired on July 24, and new Section 301 tariffs now apply to imports from about 60 economies (Penn Wharton Budget Model). A 50% Section 338 tariff on certain Canadian imports has also been widened to some paper and packaging products, with changes effective October 30 (Packaging Dive).
The pattern matters more than any single rate: when the rules change several times in a year, a landed-cost comparison made in the spring may not hold by fall. Buying from a domestic plant takes the import duty on the finished carton out of that calculation. It doesn't remove tariffs from the supply chain entirely, since paperboard, inks and plates can carry their own exposure, so ask any supplier how input-cost changes show up in your price.
“A domestic supplier takes the import duty off the finished carton and shortens the distance between a decision and a delivery.”
Switching to a domestic folding carton supplier: step by step
1. Send what you have. A few cartons from a case that runs well on your line, the dieline if you have it, your artwork files, the board spec, and your SKU count and annual volume. If your current supplier holds the dieline or art files, ask for them early; getting them back is often the first friction point. Our prepress team preflights the files you supply. We can't rebuild artwork from a printed carton.
2. Structural review. We reverse-engineer the dieline from your carton and review the structure, flaps, glue areas and scores before anything is tooled.
3. Board and caliper match. Overseas board grades don't always map directly to North American grades such as SBS, CUK (SUS) and CRB. We match substrate and caliper, and we measure the opening force of cartons that already run well for you, so new cartons are matched to how yours perform on the machine. Cartons stiffen as they age, so the goal is matching how the carton runs; an identical copy isn't realistic.
4. Samples and proofs. Free white CAD samples, usually in a couple of days, let you check fit. Proofs let you compare color against your current carton.
5. Line-fit trial. Before the first production order, cartons run on your own cartoner. That's where a new supplier earns the program. Co-packers can see how this works on our co-manufacturers page, and our cartoner requirements article covers what the machine needs from a carton.
6. First production run. You place a purchase order for the total run so board and press time are locked in, then give us the per-SKU split about a week before print, sometimes the day before. Standard production runs three to four weeks from approved proof to shipment. Finished cartons can be warehoused and released on your schedule.
You can qualify a second source before you move a whole program
Some brands qualify Graph-Pak as a second source alongside their current supplier and shift volume once the cartons have proven themselves on the line. Others move whole programs when the timing is right. Either way, we don't contact incumbent suppliers, and nobody hears from us that you're looking.
Seven questions to ask any carton supplier before you switch
- What's your lead time for a new program, from approved artwork to first shipment, and for repeat orders?
- Can you match my current carton and trial it on my line before I commit?
- Can I change the SKU split after the purchase order, and how late?
- Which certifications and food-safety practices cover the plant that will make my cartons?
- How do you catch a wrong or defective carton before it ships?
- How do board and other input-cost changes show up in my price?
- Who will I talk to after the order is placed?
For reference, Graph-Pak holds ISO 9001:2015, with ISO certification for more than 20 years, follows HACCP/GMP food-safety practices, and has a W. H. Leary inspection system with barcode mix detection on every gluer.
Graph-Pak makes folding cartons in Franklin Park and Island Lake, Illinois
We have made folding cartons in the Chicago area since 1976, and the two plants have more than 300,000 square feet between them. Our gluers have run 1.5 billion cartons since 2020, and about 200 million in a typical year. Press formats, board range, die cutting and gluing specs are on our capabilities page.