How to Spec OEM Packaging: Size, Thickness, Printing & MOQ — A Buyer's Practical Guide

Target Audience: Procurement managers, brand owners, and sourcing agents who place custom packaging orders — from startups launching their first run to established brands scaling to millions of units.

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Why OEM Specifications Matter

A vague purchase order is the single biggest cause of packaging discrepancies, production delays, and cost overruns. Whether you're ordering PE bags, paper carriers, or rigid gift boxes, clear specifications lock in the right product on the first run.

Xiamen Xiahong Plastic Products Co., Ltd. (夏宏包装) has manufactured custom packaging since 2007, with 23 production lines across two factories in Xiamen and Zhangzhou, China. Each year they produce over one billion pieces for 2,000+ global brands. Their experience shows that the difference between a smooth OEM order and a frustrating one almost always comes down to how well the original specifications are defined.

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1. Dimensional Specifications: Size and Tolerance

Bag Width × Length (× Gusset)

Specify all dimensions in millimeters using the standard convention:

```

Width (side-to-side, closed) × Length (top-to-bottom, closed) × Gusset depth

Example: 400 × 600 + 100 mm

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Width tolerance: Typically ±3 mm for PE bags, ±2 mm for paper bags
Length tolerance: Typically ±3 mm
Gusset tolerance: Typically ±5 mm

Rigid Box Outer Dimensions

For boxes and cartons, specify:

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Length × Width × Height (external), in mm

Wall thickness: 3 mm, 5 mm, or 8 mm corrugated; or 1.2 mm, 1.5 mm, 2.0 mm greyboard

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Pro Tips

Always specify internal vs. external dimensions and state which product the bag contains (e.g., "fits a 24-inch folded dress shirt")
Ask your supplier for their die-line template before finalizing artwork
Consider shrinkage: PE bags contract ~1–2% after cooling; paper bags contract ~0.5%

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2. Material and Thickness

Film Thickness (PE Bags)

Thickness is measured in microns (μm) or "mils" (1 mil = 25.4 μm). In China, it's often quoted in "gauges" (1 gauge = 1 μm).

| Application | Recommended Thickness | Use Case |

|---|---|---|

| Ultra-thin garment bags | 30–40 μm | Bulk garment shipping, low cost |

| Standard flat/zip bags | 50–70 μm | Apparel, electronics, cosmetics |

| Heavy-duty courier bags | 80–120 μm | E-commerce shipping, multi-item |

| Shopping carrier bags | 60–100 μm | Retail, supermarket |

| Bio/hanging garment bags | 70–100 μm | Premium apparel display |

Material Grades

LDPE (Low-Density Polyethylene): Soft, flexible, good clarity — most common for garment and product bags
HDPE (High-Density Polyethylene): Stiffer, noisier, lower cost — vest bags, supermarket carriers
CPE (Chlorinated Polyethylene): Frosted, premium feel — high-end product bags
PP (Polypropylene): Crisp, high gloss — header cards, OPP bags
PET film: Crystal-clear, stiff — premium display and window bags

Paper Specifications

Kraft paper: 80–300 gsm, FSC-certified options available
Art paper (coated): 128–350 gsm, for full-color print on gift bags and boxes
Greyboard (rigid boxes): 1.2 mm–2.0 mm, double-faced or triple-faced

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3. Printing Specifications

Printing Process Comparison

|---|---|---|---|---|---|

Color Specifications

Pantone (PMS): Always reference Pantone numbers for brand-critical colors
CMYK: Acceptable for process colors when Pantone isn't available
Color matching: Suppliers typically match within ΔE < 3.0; request a physical proof for critical matches
Proofing: Always approve a digital proof first, then a physical pre-production sample before mass runs

Finishing Options

Matte/gloss lamination: Protective and aesthetic
Hot foil stamping: Gold, silver, holographic — minimum 3-color registration
Embossing/debossing: Raised or recessed logo/text effects
UV spot coating: Selective gloss on logos or design elements

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4. Closure and Hardware Details

Closure Types

Open-end / flat: No closure, basic shipping
Self-adhesive (pressure-sensitive): Peel-and-seal strip, convenient for e-commerce
Zip-lock (reclosable): Slider or track-style, common for retail
Zipper / garage seal: Continuous tooth zipper, garment display use
Heat seal only: Custom, for automated packaging lines

Hardware & Add-ons

Hang holes / hang tabs: Diameter (typically 6 mm), reinforcement, position
Tear notches: Width, position, edge type
Perforation lines: For tear-open convenience
Micro-perforation: Breathability for fresh produce or certain apparel
Handles (paper bags): Die-cut, rope, ribbon, flat or loop — specify material, length, and attachment method

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5. Minimum Order Quantity (MOQ) and Pricing

Typical MOQ Ranges

|---|---|---|---|

| PE bags (LDPE/HDPE) | 500–1,000 pcs | 3,000–5,000 pcs | 5,000–10,000 pcs |

| Zipper/garment bags | 1,000 pcs | 5,000 pcs | 10,000 pcs |

| Courier/mailer bags | 500 pcs | 2,000–3,000 pcs | 5,000 pcs |

| Paper bags | 500 pcs | 1,000–3,000 pcs | 2,000–5,000 pcs |

| Rigid boxes | 200–500 pcs | 500–1,000 pcs | 1,000–3,000 pcs |

How MOQ Affects Unit Price

MOQ and unit price follow a non-linear curve:

```

MOQ 1,000 → Base price × 1.8 (low-volume surcharge)

MOQ 5,000 → Base price × 1.2

MOQ 10,000 → Base price × 1.0

MOQ 50,000+ → Base price × 0.7–0.85 (volume discount)

```

Cost Drivers

Material grade and thickness — Higher PCR content, GRS certification, or biodegradable material commands a premium
Number of print colors — Each additional flexo color adds ~$30–80 in cylinder cost
Custom tooling — Mold or die cost, typically $200–$2,000 one-time
Finishing operations — Lamination, foil, embossing add per-unit cost
Lead time — Rush orders (7–14 days) often carry a 10–20% surcharge

Sample and Approval Process

Quote request with full specifications (see checklist below)
Free digital quote within 24–48 hours
Pre-production sample (charged, refundable on order) — 5–7 days
Color proof approval — mandatory before production
Production — 15–25 days standard, 7–14 days rush
Pre-shipment inspection — request photos or third-party inspection for large orders

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6. Supplier Verification Checklist

Before placing your first OEM order, verify:

[ ] Material certificates: GRS (for recycled content), FSC (for paper), RoHS/REACH (for restricted substances), food-contact compliance if applicable
[ ] Factory audit: Sedex, ISO 9001, ISO 14001 — indicates process discipline
[ ] Sample quality: Check seal integrity, print registration, edge trimming, material feel
[ ] Tolerance confirmation: Ask supplier to confirm their standard tolerances in writing
[ ] Color proof: Compare against Pantone standard; note any ΔE deviation
[ ] Packaging for shipment: Inner bags, master cartons, palletization, shipping marks
[ ] Lead time commitment: Get the production timeline in writing
[ ] Warranty/defect policy: What happens if 5%+ of units fail QC?
[ ] Payment terms: Typical is 30% deposit, 70% before shipment; L/C available for large orders
[ ] PPWR compliance: If exporting to the EU, confirm the product meets Regulation (EU) 2025/40 requirements

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7. Internal Links to Product Pages

For reference, Xiahong Packaging's product catalog includes:

GRS Certified Recycled PE Bags — 30–100% PCR content, fully traceable
Biodegradable Plastic Bags — PBAT+PLA+starch formulations
Product Packaging PE Bags — LDPE/HDPE/CPE in all formats
Self-Adhesive Bags — peel-and-seal for e-commerce
Zipper / Garment Bags — continuous zipper for apparel display
Paper Bags & Gift Bags — FSC kraft, custom print
Rigid Gift Boxes — luxury packaging in various board thicknesses
Honeycomb Buffer Paper — bubble wrap alternative, FSC certified

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8. Soft CTA

Xiahong Packaging supports full OEM customization — from initial consultation through sampling to mass production and export delivery. With 23 production lines, GRS, FSC, Sedex, and ISO certifications, and 20+ years of experience, they handle orders from 500 to 100 million pieces.

Email fly@chinapolybags.com with your specifications to receive a quote within 24 hours, or visit chinapolybags.com to browse the full catalog.