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Pactrum Flexible Packaging
Sizing Guide 4 min read • September 2026

Pouch Dimensions Explained: Width, Height & Gusset Geometry

Master flexible pouch measurements: external lay-flat dimensions vs. internal fillable capacity, bottom gusset depth, and seal margin allowances.

Quick Answer

Flexible pouch dimensions are universally specified as Width × Height (in inches or millimeters), with bottom gusset depth denoted as +Gusset (e.g. 6 × 9 + 1.5 in). Usable internal volume is always 35mm to 50mm less than exterior height because the upper heat seal, zipper track, and lower gusset curve occupy physical internal headroom.

Essential Key Points
  • Outer dimensions measure the pouch lay-flat before filling and opening.
  • A 6 × 9 inch pouch has an effective fillable height of approximately 7.25 inches.
  • Gusset expansion reduces vertical height by 15% to 20% when the pouch is standing.
  • Always allow 35mm to 50mm of unfilled headroom below the zipper for heat sealing.

Comparison Overview

Nominal SizeMetric (W × H)Bottom Gusset DepthEffective Fillable HeightPactrum Families
4 × 6.25 in 100 × 160 mm 20 mm (total 40mm) 125 mm (approx. 5 in) Stand-Up Pouches (L001–L008)
5 × 8 in 130 × 200 mm 25 mm (total 50mm) 160 mm (approx. 6.3 in) Stand-Up Pouches (L009–L016)
6 × 9 in 150 × 230 mm 30 mm (total 60mm) 185 mm (approx. 7.3 in) Stand-Up Pouches (L017–L024)
7 × 11 in 180 × 280 mm 35 mm (total 70mm) 230 mm (approx. 9 in) Stand-Up Pouches (L025–L032)
8 × 12 in 200 × 300 mm 40 mm (total 80mm) 250 mm (approx. 9.8 in) Stand-Up Pouches (L033–L040)

Deconstructing Flexible Pouch Measurements

Flexible packaging does not behave like a rigid tin or glass bottle. As a pouch fills, its flat 2D profile transforms into a rounded 3D shape, shifting its external height and width.

The Three Zones of Vertical Height

  • Zone 1: The Top Sealing Band (15–20mm): Space above the tear notches reserved for tamper-evident impulse sealing.
  • Zone 2: The Reclosable Zipper Track (10–15mm): Polyethylene zipper profile welded into the inner walls.
  • Zone 3: The Fillable Chamber: The remaining interior space available for your product.
CATALOGUE DISCOVERY

Recommended Stand-Up Pouches

Standardized specifications relevant to Pouch Dimensions Explained.

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Frequently Asked Questions

Does the gusset measurement refer to single side or total opening?

In industry terminology, a 30mm bottom gusset means the bottom folds 30mm upward on each side, opening outward to a total elliptical base width of 60mm when filled.

Why can’t I fill a pouch right up to the zipper line?

Filling past the recommended fill line causes product dust to foul the zipper tracks and prevents heat sealer bars from clamping flat, leading to slow micro-leaks.

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Stand-Up Pouches vs. Flat Bottom Pouches: Structural Comparison
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