Tin Tie Bags.

No, a tin tie resists spillage but it is not a barrier seal. The bendable strip holds the folded top shut so the contents stay put in a cupboard, and that is all it promises. Air still moves past the fold.

For shelf life the bag is heat sealed beneath the tie at the packing line. The customer tears that seal off on first opening and then uses the tie for the rest of the bag.

Kraft / PE is the general-purpose liner, a paper outer with a polyethylene inner that gives a moisture barrier and heat seals. Coffee that needs shelf life moves up to kraft / foil / PE, the full barrier behind a paper face. Bakery needs a greaseproof liner, because butter and oil wick into bare paper and stain it.

Metallised laminate sits between the two where kraft / PE is not enough and foil is more than needed. Bare kraft on its own is not a barrier.

Yes, a one-way degassing valve fits this format and is the usual spec for coffee packed within days of roasting. Fresh beans release gas for a while, and without a vent the heat seal bulges or splits. The valve only opens outward, so the gas escapes and oxygen stays out.

Pair it with the foil liner if the bag will sit on a shelf for weeks. For a roastery selling within days, kraft / PE with a valve is often enough.

One spot colour on natural kraft is what we would recommend, and it reads as more authentic than full colour, not less. Natural brown kraft is the category default. White kraft gives a cleaner version of the same idea. Full CMYK is available but it works against the artisan cue the format carries.

Hot foil stamping on kraft is a strong contrast for premium ranges, and a clear window, often perforated so crusty bakery contents can breathe, shows the product.

The three usual builds are 3.5 by 8 inches, 5 by 10 inches and 6 by 12 inches. This is a side gusset construction with a block bottom, so the bag stands when filled and is measured as width by height with the gusset given separately.

Fill weight sets the size more than volume does. A standard retail bag of whole bean usually lands in the middle size, and the fold at the top needs an extra inch or two of height to close properly.

500 bags is the minimum for a custom-printed run. With one-colour print on kraft the plate cost is small, so the minimum quantity is genuinely workable for a single roastery or bakery. Price breaks are tiered from 1,000 units upward.

We quote up to 100,000 on the same construction.

Standard production runs 7 to 10 business days, and the rush service is 5 to 7 business days. A pre-production sample also takes 5 to 7 business days. We would fold and tie a filled sample a few dozen times, since tie fatigue is the one failure this closure has.

The sample fee is taken off your invoice when the bag order goes into production.

Plain kraft is paper and recycles as paper, but once a PE or foil liner is laminated on, most kerbside schemes treat the bag as mixed material. The metal tie should be pulled off first whichever liner is used. If recyclability is the priority, the kraft / PE build is the lighter-touch option and the foil liner is the heavier one.

Tell us which matters more, shelf life or end-of-life, and we'll spec the liner around that answer.