Introduction
Choosing the right shipping envelope is a cost and damage equation. Over-protect and you pay more per order; under-protect and you pay refunds and bad reviews. For e-commerce sellers, the difference between kraft, bubble, Tyvek and poly mailers can be cents per order — multiplied by thousands of shipments.
This guide compares the four main shipping envelope categories across protection, cost, printability and postage, with a decision framework you can apply to any product line.
The Four Contenders
| Type | Protection | Weight | Cost/Unit | Best For | |
|---|---|---|---|---|---|
| Kraft envelope | Low–medium | Light | Lowest | Good (spot/white ink) | Documents, apparel, non-fragile |
| Bubble mailer | High (cushioning) | Medium | Medium | Good on white/kraft | Fragile items, electronics, cosmetics |
| Tyvek envelope | High (tear/water) | Lightest | High | Good (UV inks) | International docs, valuable items |
| Poly mailer (PE) | Low | Lightest | Low | Good (corona) | Apparel, soft goods, non-fragile |
Decision Framework
1. What’s inside? (Protection first)
| Contents | Recommended |
|---|---|
| Documents, contracts | Kraft or Tyvek |
| Apparel, fabric (non-fragile) | Poly mailer (cheapest) or kraft |
| Electronics, small parts | Bubble mailer |
| Cosmetics, glass, ceramics | Bubble mailer (double-wrap if fragile) |
| Books (with jackets) | Bubble mailer |
| International valuable documents | Tyvek |
| Flat artwork, posters | Rigid kraft / document envelope |
2. What’s the damage risk?
- Low risk (apparel, documents) → kraft or poly — save the cents
- Medium risk (books, small electronics) → bubble mailer
- High risk (glass, electronics with screens) → bubble with padding, or box
Rule of thumb: if you’re shipping something you wouldn’t want dropped from 1 meter, use bubble; from 2 meters, use a box with proper void fill. No envelope replaces a box for truly fragile goods.
3. What’s the branding priority?
- Premium unboxing → custom printed bubble mailers (white) or branded kraft
- Eco brand image → kraft with recycled content + minimal ink
- Cost-first → plain poly mailers
4. Postage math
| Envelope (9×12 class) | Approx. weight | Postage factor |
|---|---|---|
| Kraft 24 lb | Lightest | Lowest |
| Tyvek | Light + strong | Low (weight-based) |
| Poly mailer | Lightest | Lowest |
| Bubble mailer | +10–20 g | Slightly higher |
At scale, weight differences of 10–20 g per unit change your shipping rate tier. Run the math on your actual weights — see the size charts to plan.
Quality Checks Before Ordering
- Kraft — fiber direction, fold cracking test, grammage verification
- Bubble — bubble burst rate ≤ 1%, air retention, seal strength
- Tyvek — grade verification (1025D/1056D/1073B), seal adhesion, water test
- Poly — film gauge, seal strength, print adhesion
Full factory standards in each dedicated guide: kraft · bubble · Tyvek/durable
FAQ
What is the best envelope for shipping clothes?
Poly mailers or kraft envelopes — non-fragile soft goods don’t need cushioning. Poly is cheapest; kraft looks more premium and eco-friendly.
Can I ship electronics in bubble mailers?
Small, sturdy electronics (accessories, cables, small components) ship fine in bubble mailers. Devices with screens or fragile internals should ship in boxes with void fill.
What’s the difference between kraft and poly mailers?
Kraft is paper — eco-friendly, printable, slightly heavier and less water-resistant. Poly mailers are plastic film — cheaper, lighter, waterproof, but less premium and harder to recycle.
How do I choose shipping envelope sizes?
Order by internal dimensions with clearance: contents + 10–15 mm each side (bubble lining reduces usable space). See bubble envelope sizes.
Are Tyvek envelopes worth the cost?
For international documents, high-value flat items, and anything needing water/tear protection, yes — the protection justifies 3–5× the material cost. For domestic routine shipping, kraft or bubble is usually enough.
Can I get custom printed shipping envelopes?
Yes — branded bubble, kraft and poly mailers are standard production. Request a quote with your sizes and quantities.