Stand-Up Mylar Bags.

The K-seal is the gusset weld that lets the bag open into a flat base and stand when filled. The seal runs in a K shape at each lower corner, locking the gusset to the front and back panels so the base holds square under the weight of the contents. Empty, the whole thing folds flat for shipping and storage.

Heavier fills get a reinforced base film in the gusset area, since that is where the K-seal takes the load.

Around 2 kg is the practical ceiling for a doypack base. Beyond that the gusset bows and the bag leans on the shelf. Film gauge runs 0.10 to 0.20 mm, with 0.12 to 0.14 typical for retail fills, and a thicker gauge helps but does not change the limit much.

For heavier fills we would move you to a quad seal bag, which stands on four sealed corners rather than one gusset.

Press-to-close and pull-tab zippers are both available, and a heat-seal-only bag is the option when the contents are used in one sitting. A tear notch sits above the zipper so the first opening breaks the top seal and leaves the track intact. A certified child-resistant zipper can be fitted where the market requires it.

Coffee bags take a one-way degassing valve, and a hang hole can be punched for peg display.

Matte lamination is the most requested finish, and it hides handling marks better than gloss. It reads well in natural, organic and wellness ranges. Gloss gives saturated colour and suits busy mass-retail fixtures where the pack has to shout a little.

Print is gravure, CMYK plus Pantone, across the front, back and gusset. Soft-touch, spot gloss over matte and a metallic reveal, where unprinted areas show the metallised layer as mirror silver, are the usual upgrades.

The size is given as three figures: width by length plus the gusset depth. Common builds are 5 by 8 inches with a 3 inch gusset and 7 by 10 inches with a 3.5 inch gusset. Stock metric sizes run 10 by 15, 12 by 16, 15 by 25, 20 by 30 and 25 by 35 cm.

Powders pack denser than nuts or freeze-dried pieces, so fill-test a sample with your product. The bag should stand at about 80 percent full without tipping.

Yes, 500 bags is where a custom-printed run begins. Per-unit cost drops noticeably once the order passes 1,000 and again around 2,500, but a first run at the minimum still gives a production-quality batch to test fill, standing and shelf presence on before committing to volume.

The upper end of a single run is 100,000 units.

Standard turnaround is 7 to 10 business days once artwork is approved. A rush slot brings that to 5 to 7 business days. Samples take 5 to 7 business days too, and a filled sample is the only honest way to check that the base stands square.

Whatever the sample costs gets credited against the production run.

Yes, wherever a window sits, the bag loses its light barrier at that spot. The clear PET panel keeps a reasonable oxygen barrier but lets light through, so a full-front window, an oval, a side strip or a die-cut shape each cost a little shelf life. Coffee beans and snacks generally accept the trade; light-sensitive contents should stay opaque.

If the contents must be seen and shelf life matters, a small strip window on the back panel is the compromise we suggest.