Mylar Bag Thickness Guide: 3 vs 5 vs 7 Mil Compared

What a mil means

A mil is one thousandth of an inch. 3 mil is light-duty film, 5 mil is the general-purpose standard, and 7 mil is heavy-duty. Thickness buys puncture resistance and seal integrity — not barrier quality, which comes from the metalized or foil layer, not the film gauge. Paying for 7 mil when your product is soft and light is wasted money.

Choosing by product

• 3 mil — light, soft products: teas, powders, samples, short shelf life
• 5 mil — the default: coffee, supplements, dried food, anything with sharp edges like whole herbs
• 7 mil — heavy, dense or sharp contents, long-term storage, and anything that must survive rough freight
• Add a zipper before you add thickness — resealability usually matters more to customers than gauge

Pair the pouch with a box

A pouch alone ships badly and shelves worse. The standard retail configuration is a sealed pouch inside a printed folding carton that carries the brand, the nutrition or supplement panel and the barcode. Specify both together so the carton is die-cut to the pouch’s real footprint — no rattle, no void fill, no dimensional-weight tax.