Center seal (pillow) pouches feature a longitudinal rear seam down the center back, offering high tensile burst strength and economical automated packaging for bulk dry goods. Three-side-seal pouches are flat pouches heat-sealed along both sides and the bottom, providing a completely smooth front and rear display area ideal for single-use portions, spices, and vacuum sealing.

Essential Key Points

Center seal pouches have a back fin/overlap seal; three-side-seal pouches have perimeter edge seals.
Three-side-seal pouches lay completely flat and are easily stacked or hung on peg boards.
Center seal pouches expand into a cylindrical pillow shape when gas-flushed or filled.
Both formats offer high-speed filling compatibility on automated packaging equipment.

Comparison Overview

Feature	Center Seal (Pillow) Pouch	Three-Side-Seal Pouch
Seam Location	Vertical center line on rear panel	3 perimeter edges (left, right, bottom)
Expansion Behavior	Expands symmetrically into pillow	Remains flat unless filled with fine powder
Rear Display Area	Split by center vertical seal	100% uninterrupted smooth rear panel
Vacuum Sealing	Less common due to rear fold	Standard format for vacuum packaging
Typical Applications	Chips, namkeen, pulses, bulk flour	Spices, seasonings, single-serve pharmaceuticals

Flat Packaging Architectures

Non-standing flexible pouches remain the most widely produced packaging worldwide due to their unmatched cost efficiency, high packaging line speeds, and minimal material usage.

Center Seal Mechanics

Center seal pouches (pillow bags) are formed from a single continuous web of film wrapped around a forming collar on vertical form-fill-seal (VFFS) machinery. The two edges of the film are fused down the center back, followed by horizontal top and bottom cross-seals. This structure provides high structural resistance against internal hydraulic shock when cartons are stacked in transit.

Three-Side-Seal Mechanics

Three-side-seal pouches are produced by joining two independent sheets of film or folding a single web in half and sealing three edges. The resulting pouch has completely flat front and back faces with zero obstructions, allowing seamless label application or pre-printed graphics.

CATALOGUE DISCOVERY

Recommended Three-Side-Seal Pouches

Standardized specifications relevant to Center Seal vs. Three-Side-Seal.

View all 81 SKUs

L041

Transparent

7 × 10 in Transparent Three-Side-Seal Pouch

7 × 10 in

Made to Spec

Custom

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L042

Transparent + Metallised

7 × 10 in Transparent + Metallised Three-Side-Seal Pouch

7 × 10 in

Made to Spec

Custom

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L043

Metallised

9 × 9.5 in Metallised Three-Side-Seal Pouch

9 × 9.5 in

Made to Spec

Custom

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Frequently Asked Questions

Which format is better for vacuum sealing?

Three-side-seal pouches are the industry standard for vacuum packaging because their flat perimeter edges form an airtight seal without seams crossing the sealing bar.

Can three-side-seal pouches include tear notches?

Yes. Three-side-seal pouches can be supplied with laser or die-cut tear notches on either side for easy opening.