3 Side Seal Pouches (Flat Pouches): Buyer's Guide — Material, Size & Custom Printing

3 Side Seal Pouches: The Buyer's Guide to Flat Pouches & Sachet Packaging

If you need simple, affordable, and reliable packaging for single servings, sample packs, spice sachets, skincare sachets, the 3 side seal pouch is the format to look at.

Also known as a flat pouch, three side sealed bag, or sachet, this is the most widely used flexible packaging format worldwide — it uses less material, costs less to produce, fills faster on high-speed lines, and ships flat to save freight.

In this guide we cover what global buyers need to know about 3 side seal pouches — material, sizing, and how they compare with stand-up pouches.

What Is a 3 Side Seal Pouch?

3 side seal pouch structure showing three sealed edges and one folded edge

A 3 side seal pouch is a flat flexible bag made by folding a single sheet of laminated film in half, then heat-sealing two side edges and the bottom. The top stays open for filling, then is sealed after loading.

Key features:

Three sealed edges (left, right, bottom) and one folded edge — giving a cleaner look
Flat profile that stacks, bundles, and ships with zero wasted space
Fewer seal lines = fewer failure points, excellent for vacuum packaging

This simple structure is why 3 side seal pouches dominate the sachet and single-serve market worldwide.

Why Choose 3 Side Seal Pouches?

Lowest cost per unit — no gusset, no bottom panel, no zipper mechanism means less raw material. Production cost is typically 15–30% lower than stand up pouches of the same size and material.

Fastest filling speed — flat pouches feed smoothly through FFS machines at 300+ pouches per minute, ideal for high-volume single-serve products like spice sachets and instant coffee sticks.

Full print coverage — flat front and back panels provide large printable area. We support up to 9-color HD printing with full CMYK color matching.

Material Structures

Three side seal pouches in different materials — BOPP transparent, aluminum foil

The performance of a flat pouch depends on its laminate structure:

Material	Barrier	Best For	Shelf Life
BOPP/CPP	Basic	Dry spices, candy, snacks	3–6 months
PET/PE	Medium	Skincare sachets	6–9 months
PET/VMPET/PE	High	Coffee sachets, seasoning	9–12 months
PET/AL/PE	Hihest	Pharma sachets, export food	12–24 months

For products extremely sensitive to oxidation — coffee, nuts, pharmaceutical powders — aluminum foil (PET/AL/PE) is the standard. Learn more about why high-barrier aluminum film is critical for freshness.

3 Side Seal vs Stand Up Pouch: Which Should You Choose?

3 side seal flat pouch vs stand up pouch — flexible packaging format comparison

This is the most common question from buyers. Here is a quick decision guide:

Factor	3 Side Seal (Flat Pouch)	Stand Up Pouch
Self-standing on shelf	No — needs support	Yes — stands on its own
Cost per unit	Lower	15–30% higher
Filling speed	Faster (300+/min)	Slower (80–150/min)
Shelf display	Good with hang hole or display box	Excellent — its own billboard
Resealability	Optional zipper, usually heat-seal	Zipper standard

Quick rule:

Single-serve or sachet (coffee stick, spice, face mask,) → 3 side seal
Needs to stand on shelf and be re-closed by consumers → stand up pouch
Premium flat-bottom display for coffee or tea → eight side seal pouches

Common Sizes

Size (W × H mm)	Volume	Typical Use
60 × 80	5–10 g	Sample sachets, hotel amenities
80 × 120	10–30 g	Spice sachets, coffee sticks
100 × 150	30–50 g	Snack portions, skincare sachets
130 × 200	50–100 g	Tea bags, pet treats
150 × 220	100–200 g	Snack bags, dried fruit

All sizes are fully customizable — send us your target weight and product density, and we will recommend the optimal flat pouch size.

Which Products Use 3 Side Seal Pouches?

Three side sealed bags work across many industries:

Food: instant coffee sticks, tea sachets, spice packs, sugar/salt sachets, candy, dried fruit samples, sauce sachets
Skincare: face mask sachets, shampoo/lotion samples, perfume testers
Home care: Liquid laundry detergent，laundry powder
Pet food: single-serve treat sachets, sample packs

For liquid products in larger volumes (200 ml+), consider spout pouches for leak-proof packaging.

Get a Free Quote

Daoxing packaging factory — 3 side seal pouch manufacturer in China

Not sure which material, size, or closure fits your product? As a flexible packaging manufacturer with 6+ years of export experience, we will recommend the right 3 side seal pouch specification and send a free quote within 24 hours.

MOQ starts from 10,000 RMB — ideal for new brands testing the market. Trial orders ship in 7–12 working days.

Contact us today, or explore more packaging guides: