A packaged retail product is mostly air. The item itself might be the size of a deck of cards, and by the time it's sealed into a hanging pack it's a rigid rectangle four times the volume that won't nest against anything.
That matters because you pay for volume twice. Once to move it and once to store it. Every mile and every month that product spends packaged is more expensive than the same product unpackaged, which raises a question most companies never ask: where in the supply chain does the packaging need to go on.
The formats, and what each one is for
Blister packs hold a product in a formed plastic cavity sealed to a printed card. Common for small consumer goods, hardware, electronics and pharmaceuticals. The card carries the branding and the hang hole, so these are built for pegboard. They're relatively cheap per unit and relatively flat, which makes them the least bad option from a shipping standpoint.
Clamshells are a single piece of plastic hinged to fold around the product and seal shut. More protective, much harder to open without scissors, and much harder to shoplift, which is why high-value small items end up in them. They're also bulkier and more expensive than a blister card, and the shape rarely stacks efficiently.
Shrink and multipacks bundle units together with film, sometimes over a tray or pad. This is what you see in club stores and in grocery multipacks. It's the cheapest format to apply and the easiest to change, which is why it's usually the right answer for a promotion.
Plain case and bulk is the absence of retail packaging. If the product is sold from a carton, a bin, or by a distributor rather than off a shelf, retail packaging is cost with no return.
The format usually isn't your decision
Retailers set most of this. A chain with pegboard fixtures needs a hang hole. A chain with limited shelf depth will reject a clamshell that eats three inches of facing. Some accounts require tamper evidence, some restrict plastic, and most have a written spec covering pack size, label placement and carton markings.
Which means the useful sequence is to get the receiving customer's requirements first and then decide. Companies that pick a format they like and then take it to the buyer usually end up doing it twice.
Where the cube math actually bites
Take an item that ships loose at a few hundred units to a case. Put each unit in a clamshell and the same case now holds a fraction of that. Same product, same value, more than double the freight and more than double the pallet positions.
If the packaging goes on at an overseas plant, you're paying that penalty across an ocean container, an inland move, and however many months the inventory sits before it sells. If it goes on at a warehouse two hours from the retailer's DC, you paid it for two hours.
This is the entire argument for packing late, and for most importers it's a larger number than the labor difference.
When packing late is worth it
When one product goes to retail in more than one format. A unit that ships as a single to one account, a two-pack to a club, and a shipper of twelve to a third gets built as a single SKU and configured on demand.
When you're importing. Container space is the most expensive volume in your supply chain. Filling it with formed plastic is a poor use of it.
When the program is uncertain. A promotional pack that may or may not extend past the window shouldn't be committed to at the factory.
When the retail spec is still moving. Packaging applied downstream can change next week. Packaging applied at the plant cannot.
When it isn't
When the packaging is what protects the product in transit. If it needs the clamshell to survive the container, the clamshell goes on early.
When volume is very high and very stable. At enough scale, an automated line at the plant beats hand assembly by more than the freight savings.
When the format needs tooling or equipment that only the manufacturer has. Heat-sealed packs with custom-formed trays are made where the tooling is.
Four things to settle before you commit to a format
Regulatory and labeling requirements first. Country of origin, language panels for product going to Canada or Mexico, tamper evidence, any category-specific requirement. This one is first because it's the one that gets a load rejected at the door.
The receiving customer's spec, in writing. Not what the buyer said on a call.
Transit protection. What the package has to survive between where it's applied and where it's sold.
Shelf presentation last, which is the reverse of how most companies approach it. A beautiful package that fails any of the first three is a rework project waiting to happen.
What we do with this
Clark applies retail packaging downstream: shrink and multipacks, retail-ready configurations, labeling, inserts, and pack-out to a retailer's spec. For customers already storing product with us, the packaging step usually costs less than the freight it saves.
We don't currently run blister or clamshell sealing. Both need dedicated equipment and product-specific tooling, and we'd rather point you to a converter than take the work and do it slowly.
What we aren't is a packaging designer or a converter. We don't create the artwork, build the tooling, or manufacture the packaging. We execute a spec, and we'll tell you before we start if the spec has a problem we can see from the floor. Companies that need the design work done should have that done first, then bring us the finished spec and the materials.
If you're carrying product that gets packaged before it needs to be, the cost of finding out is one conversation.