Three-Side-Seal Pouches: Uses, Materials & Comparisons
Choosing three-side-seal bags for your product
Three-side-seal pouches are flat packs with three edges sealed and one opening left for filling. After packing, the remaining opening is sealed. They suit portions, spice blends and samples. Finished dimensions include the seal margins, so the available space inside the pouch needs to be considered when setting the bag size.
Three-side-seal pouch specifications
Parameter | Specification |
|---|---|
Construction | Three sealed edges and one filling opening. Finished width and height include the sealed margins. |
Material options | PET/PE, PET/VMPET/PE or PET/NY/PE, selected for barrier, puncture resistance and the filling process. |
Seal and opening details | The drawing identifies seal widths, tear notches and any zipper or hanging hole. |
Usable filling space | The product occupies the space inside the seal lines; headspace and the final closing seal are included in the sizing review. |
Gravure printing MOQ | 6,000 linear metres of printed film, measured along the roll. Bag quantity follows the print repeat, web layout and conversion allowance. |
Quotation | Itemized quotation within 24 business hours. |
Choose a three-side-seal pouch for your product
Structure and filled-pack checks
Two faces form a flat pouch with perimeter seals. Finished width and height include those seals, so usable internal space is smaller. Opening direction, tear notch and any hanging hole need to be positioned around the product and final sealing area.
Construction details
Use the details below to review the drawing, filling process and filled sample.
1. Supplied opening
Confirm the open edge used for filling. A pre-made three-side-seal pouch is supplied with an opening for filling and is then closed. Mark the supplied opening and the final seal on the drawing.
2. Seal margins
Separate usable space from finished size. Finished width and height include the seal margins. Confirm the usable internal space, product thickness and opening clearance before approving the dimensions.
3. Tear notch
Position the tear notch for the opening direction and seal width. The notch makes the pack easier to open while the seals and laminate provide product protection.
Common applications
Single-use powders and condiments
Flat portions can be convenient for samples or measured use. Powder flow, fill volume and a clean seal area determine whether the proposed opening works. Very small packs should also be assessed for consumer opening and legible labeling.
Vacuum-packed foods
Vacuum-rated flat pouches commonly use PA/PE or other specified barrier constructions. Smooth chamber-machine pouches and embossed bags for external-suction sealers use different constructions. Specify the machine, product shape and cold-storage or heat-processing requirements.
Personal-care samples and non-food parts
Flat pouches suit small portions, liquids, gels and components displayed flat or hung. Select formulation compatibility for liquids and gels, and puncture or abrasion protection for parts.
Advantages
Direct geometry
The two main panels make artwork and size communication relatively straightforward.
Flat presentation
This format works well hanging, lying flat or arranged inside an outer pack.
Flexible opening options
Tear notches, hanging holes or certain reclosures can be discussed, with their impact on seal area and capacity considered.
Practical considerations
Flat or hanging display
Conventional three-side-seal pouches suit flat or hanging display. Choose a gusseted format for an upright shelf pack.
Limited useful mouth and capacity
Seal widths, product thickness and filling access reduce the space available inside the nominal dimensions.
Opening and handling risk
A tear that runs through the wrong area or a hard product pressing on a seal can undermine an otherwise suitable structure.
Compare bag types
Compared with stand-up pouches
Use a stand-up pouch when upright display or repeated scooping matters. Use a flat pouch when single-use, compact shape or hanging presentation better matches the product. Barrier performance must be compared independently. Read the stand-up pouches guide.
Compared with back-seal pillow bags
Pillow bags have a longitudinal back seam; three-side-seal pouches have perimeter seals. Choose the layout that suits the filling equipment and finished pack. Read the back-seal pillow bags guide.
Compared with spout pouches
A spout can add controlled dispensing and reclosure for liquids. A tear-open flat portion avoids that component when the product is used at once. Read the spout pouches guide.
Specifications for your quote
Provide the specifications you know and mark any open items as "to confirm".
Specification | What to provide or verify |
|---|---|
Finished and usable dimensions | State seal widths, filling edge and required internal space. |
Opening and presentation | Confirm tear direction, notch, hanging hole and whether the pack will be flat, hung or boxed. |
Product and protection | State contents, target fill, storage and distribution. Identify barrier, puncture, chemical or thermal requirements that need verification. |
Material and thickness | Choose the material structure and thickness for the application and agreed trials. |
Artwork and quantity | Provide print files or artwork status, finish, quantity per design and size, destination and required schedule. |
Sampling and documentation | Agree sample type, machine or filling trials, acceptance criteria and relevant supporting documents before order approval. |
Questions before ordering
How are the three supplied seals and filling opening arranged?
The pouch arrives with three edges sealed and one edge open for filling. Seal that final opening after the product is packed.
How is this format used for vacuum or retort?
For vacuum packing, match the film, pouch surface and final heat seal to the vacuum machine. Retort requires a separately specified heat-resistant laminate, adhesive and sealant for the thermal cycle. A vacuum pouch is not automatically a retort pouch.
How do I calculate usable filling space?
Calculate usable filling space after allowing for seal widths, product thickness and headspace.
What are the MOQ, sample lead time and production schedule?
For gravure-printed packaging, the MOQ is 6,000 linear metres of printed film. Normal production takes 15 working days for a first order and 10 working days for a repeat order, counted from signing the formal contract. Shipping time is additional. Send your material, dimensions, quantity per design and artwork status so we can confirm the sample plan.
What evidence should be agreed before approval?
Confirm the specification, sample approval, relevant trial results and acceptance criteria. For regulated applications, identify the market, intended use, document issuer and scope.
Prepare your packaging request
Send the product, target fill, storage or shipping conditions, filling method, quantity per design and destination. Include a sample or drawing if available. Configure three-side-seal bags and request a quote.
Compare all packaging types · Food packaging material guide · Procurement checklist