Mailer comparison
Bubble mailers vs poly mailers
Bubble mailers and poly mailers are the two most common lightweight shipping envelopes in DTC and ecommerce. They split on one core question: does the item need cushioning, or just a weather-resistant bag?
This guide compares both on protection level, weight, water resistance, recyclability, and cost so you can route the right SKU to the right product.
Side-by-side comparison
| Attribute | Bubble Mailer | Poly Mailer |
|---|---|---|
| Construction | Outer kraft or poly skin laminated to an inner air-bubble layer | Single-layer co-extruded LDPE film, no padding |
| Cushioning / protection | Light to moderate impact and abrasion protection from the bubble layer | None - protects only against scuffing, dust, and water |
| Best for | Electronics accessories, jewelry, books with hard corners, cosmetics, small fragile items, returns of small goods | Apparel, soft goods, plush, accessories, anything non-fragile |
| Empty weight (e.g. 9x12) | Roughly 0.5-1.0 oz - adds to dim weight | Roughly 0.2-0.4 oz - one of the lightest shipping options |
| Water resistance | Good - poly outer is water-resistant; kraft outer is not | Excellent - fully water-resistant LDPE film |
| Tear resistance | Good | Very good - LDPE stretches before tearing |
| Recycling note | Mixed materials can make recycling difficult; confirm exact construction | Check resin code, labels, adhesive, and local store drop-off rules |
| Branding / print | Custom print available, smaller print area on most stock SKUs | Large flat print surface - the standard format for branded DTC packaging |
| Cost per unit | Roughly 2-4x the cost of an equivalent-size poly mailer | Lowest-cost mailer format |
| Storage footprint | Bulky - bubble adds thickness | Very thin - cartons of 1,000 take little shelf space |
When to choose which
Choose bubble mailers when: the item is small and fragile or has hard corners that could puncture a poly mailer (jewelry, watches, electronics, cosmetics in glass, small ceramics). Also a fit for returns programs where customers reuse the mailer.
Choose poly mailers when: the item is soft, non-fragile, or already in a retail box (apparel, plush, blankets, towels, accessories). Poly mailers minimize dim weight, maximize branding surface, and are usually 2-4x cheaper than bubble.
Mixed shops: standard practice is poly mailers as the default for soft goods plus a small set of bubble mailer sizes (typically #000, #0, #2, #4) for the fragile SKUs.