Three Side Seal Bags.

The simplest flexible pack there is. Two sheets of film laid together and sealed along three edges, leaving the fourth open for filling — then sealed after the product goes in.

Some are made from a single sheet folded in half, so the fold forms one edge and only three seals are required. Either way the finished bag is a flat rectangle with no gusset, no base and no built-in closure.

You will also hear it called a flat pouch, a sachet, or a pillow pack, though "pillow pack" more properly describes a back seal bag.

Choose the three side seal when the product is used in one sitting and cost per unit is the deciding factor. Samples, single-serve portions, sachets, trial sizes, flat products like wipes and masks, and anything hanging on a peg.

Choose a stand-up pouch when the pack has to present itself on a shelf or the product is used over several sittings and needs reseal.

The three side seal is meaningfully cheaper — less film, fewer steps, no zipper — but it will not stand and it holds much less for its face area. If you find yourself wanting to add a zipper and a gusset to one, you have specified the wrong format.

Yes, and for high-volume sachet production that is normally how it is done.

Instead of finished bags, we supply printed laminate as roll stock. Your form-fill-seal machine forms the bag, fills it and seals it in one continuous operation. It is far faster than filling pre-made bags and it is the standard for anything running at real volume — condiment sachets, single-serve supplements, instant drinks.

Tell us the machine and web width at quote stage, because the print repeat and reel specification have to match your equipment.