Reviewed and expanded August 2026. Carrier rules, product availability, and pricing can change; confirm current details before shipping.
Poly mailers
Plain poly mailers are thin flexible envelopes commonly used for clothing and other soft, non-fragile goods. They add little weight and conform to the product, which can reduce unused package volume.
Bubble mailers
Bubble mailers add an inner cushioning layer. They can work for compact items that need modest surface and impact protection but do not require a rigid box. The cushioning does not make them crush-proof.
Side-by-side comparison
| Factor | Poly mailer | Bubble mailer |
|---|---|---|
| Weight | Very low | Low to moderate |
| Moisture resistance | Generally good when sealed | Varies with outer material and seams |
| Cushioning | Minimal | Moderate surface/impact protection |
| Crush protection | None | Limited |
| Storage space | Very compact | Bulkier |
| Good examples | Clothing, soft goods | Some books, accessories, small durable items |
Clothing is a classic poly-mailer use case
A folded garment usually does not need a corrugated shell. Many sellers place the garment in an inner bag for presentation or protection, then use an opaque shipping mailer. Avoid overstuffing; stretched seams and closure strips are more likely to fail.
Books require more judgment
A bubble mailer may be adequate for some inexpensive paperbacks, but corners and covers can still be bent. Collectible, heavy, or high-value books often justify corrugated protection. See Shipping Supplies for Book Sellers.
Sharp or rigid items
An item with corners, blades, protrusions, or hard edges can puncture a flexible mailer from the inside. Use internal protection or move to a box. Never rely on the outer plastic alone to restrain a potentially damaging edge.
Choosing the size
Mailer listings may show outside dimensions while the usable inside area is smaller because of seals and flap construction. Measure the packed product’s length, width, and thickness. Our mailer size chooser provides a planning estimate.
Returns and resealable designs
Some e-commerce mailers include a second adhesive strip for customer returns. That feature can simplify reverse logistics if returns are common. If returns are rare, do not pay significantly more solely for a feature you seldom use.