Primary Pack Selection: Starting From the Formula, Not the Look

Primary pack selection usually starts with a mood board and ends with a compatibility failure. The order should be reversed: viscosity, chemistry, oxygen sensitivity, use occasion and channel decide the pack, and the aesthetic treatment comes after a viable pack exists.

1. Viscosity first

A formula below 5,000 mPa·s suits a dropper or a spray; 5,000 to 30,000 suits a pump; above 30,000 suits a tube or a jar. Choosing a dropper for a cream produces a product that cannot be used. The viscosity is known before the pack discussion should begin.

2. Chemical compatibility

Alcohol above 20 percent rules out PET and many elastomers. Strong acids rule out soda-lime glass over long storage. Essential oils rule out natural rubber. Each of these is a hard constraint, and it should be checked against a compatibility table before a design brief is written.

3. Oxygen sensitivity

A formula with vitamin C, retinol or a natural fragrance needs an airless pack, an ABL tube or a glass bottle with a tight seal. A jar is the worst option for a sensitive active because the surface is exposed at every opening. Sensitivity determines whether airless is required rather than preferred.

4. Use occasion

A product used in the shower needs a squeezable, wet-hand-friendly pack with a flip-top. A product used at a dressing table can be a dropper or a jar. A product carried in a bag needs a small, sealed, non-leaking pack. The occasion determines the closure as much as the body.

5. Channel

E-commerce needs a pack that survives a parcel and photographs well on a white background. Retail needs shelf presence and a pack that survives handling. Travel retail needs a size that fits a liquid allowance. Each channel shifts the weight toward a different format.

6. Dose

The dose per use should be close to the pack’s natural dose. A 30 ml serum at 0.3 ml per use lasts 100 applications; a 200 ml lotion at 2 ml lasts 100. A pack that doses 0.5 ml from a 30 ml bottle delivers 60 applications, which customers notice as the product running out early.

7. Refill and reuse

A refill system needs a durable outer pack and a cheap inner cartridge, plus a customer willing to handle it. It works well for a product used daily and poorly for a product used occasionally. The refill should be priced at 70 to 80 percent of the full unit to be attractive.

8. Cost and MOQ

A stock pack at 1,000 units is the cheapest route to market. A custom pack at 30,000 units is cheaper per unit but carries inventory risk. For a first run, stock components with a printed label or a sleeve deliver 80 percent of the premium look at 10 percent of the commitment.

9. Regulatory space

The pack must carry the INCI list, net weight, batch code, PAO and responsible person information. A 15 ml dropper bottle has very little surface, and a folded leaflet or a QR code may be needed. Check the space before approving the size.

10. Testing

Every pack choice should pass a filled compatibility test at 40 degrees for twelve weeks, a drop test, a transit test and a use test with real consumers. Skipping the use test is how brands end up with a pack that looks excellent and dispenses badly.

11. Where it fits

Pack decisions run across the lotion range; the airless branch continues in the pack comparison entry.