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1. Three Side Seal Pouch, 3 Side Seal Bag and Three Sided Pouch — These search terms normally refer to a flat premade pouch sealed on three edges with one edge left open for filling and final sealing. The canonical product is the three side seal pouch. Confirm the opening side, finished dimensions, seal widths and tear-notch position on a drawing because suppliers may describe orientation differently.
2. Use Cases and Filling Method — Three side seal pouches can be evaluated for powder, seasoning, coffee portions, snacks, samples, wet products and small industrial parts. Premade bags may be filled manually, semi-automatically or by compatible pouch equipment. A form-fill-seal machine usually converts roll film rather than feeding an already finished three side seal pouch, so buyers should not treat premade pouches and rollstock as the same supply format.
3. Seal Layout and Artwork — Specify width, height, opening side, top-seal allowance, side- and bottom-seal widths, tear notch, hang hole and any rounded corners. Keep critical text, codes and registration-sensitive artwork outside seals, notches and trim tolerances. For liquid or contamination-prone products, confirm the clean seal area and filling control before approving dimensions.
4. Material and Barrier Direction — PET/PE, BOPP/CPP, PET/VMPET/PE and PET/AL/PE are possible structure families, not fixed recommendations. Select films and thicknesses from product form, moisture and oxygen sensitivity, aroma, light exposure, fill temperature, shelf life, opening and sealing conditions. VMPET is metallized film and is not the same as aluminum foil.