Use poly mailers for soft goods that crush without harm, bubble mailers for light items that need a little cushioning, and boxes for anything rigid, fragile, heavy or oddly shaped. The question to ask for every item is simple: what is the worst thing that can happen in transit, and which package stops it? Moisture, crushing, puncture and impact each point to a different choice.
Our packaging materials budget list covers what to stock. This guide is item by item: it helps you decide which to use for a sweater, a hardcover, a pair of boots or a glass dish. It makes no postage claims, so run any choice through your carrier's current calculator.
Start with the Failure You Are Preventing
| Risk | What it looks like | Best match |
|---|---|---|
| Moisture | Wet or damp item on arrival | Sealed inner bag, plus any outer package |
| Crushing | Bent corners, flattened hats, creased books | Box or rigid mailer |
| Puncture or tearing | Hole through a thin mailer | Box, or a padded mailer for light, smooth items |
| Impact | Cracked glass, chipped ceramic | Box with padding on all sides |
Everything else, including cost and storage, comes after protection.
Poly Mailers: Soft Goods
A poly mailer is a lightweight plastic envelope. It suits clothing, scarves, linens, soft bags and other items that do not mind being squeezed. It is water-resistant on the outside, but seams and tears can let moisture through, so put sensitive items in a sealed inner bag first. It does not protect against crushing, and sharp corners or hard buckles can puncture it. Fold the garment neatly, remove air and seal the mailer.
Avoid a poly mailer for anything with hard edges, glass, electronics or items that need to hold a shape, like hats and structured bags. For winter transit, see our winter shipping guide.
Poly Mailers in the Sizes You Use Most
Pick one or two sizes that fit your usual folded garments, and check whether the mailer is opaque and self-sealing.
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Bubble Mailers: Light Items with a Little Cushion
A bubble mailer has an air-cushion lining. It works for light, smaller items that need protection from scuffs and light knocks: paperback books, DVDs, small accessories, trading cards inside a rigid holder, or small boxed jewelry. It does not replace a box for fragile or heavy items. Choose an interior size that fits the item without crushing the cushion, and leave room to seal it cleanly.
Paper-based padded mailers are also sold as an alternative to plastic bubble mailers. They may suit some items, but check the product description for how they handle moisture, and for how they are meant to be recycled. Choose whichever fits the item and your buyers.
Do not overstuff. A bulging bubble mailer stresses the seal and the seams. If the item feels like it is pushing against the lining, move up a size or switch to a box.
Bubble Mailers for Light, Small Items
Choose an interior size that fits the item without compressing the cushion, and check whether the seal is self-adhesive.
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Boxes: Rigid, Fragile and Awkward Shapes
A box gives crush protection and a stable shape. Use it for glassware, ceramics, shoes, hardcover books, electronics, hats and anything with a shape to preserve. The box should be big enough for padding on every side but not so big that the item can move. Void fill (paper, air pillows or foam) keeps the item centered; tape all seams. Delicate items may need a double-box setup, which our fragile shipping guide covers.
Heavier items call for a stronger box, and the maker's listing or the markings on the box are the place to check any stated strength or weight rating rather than guessing. If an item is both heavy and fragile, size up the box and the padding together instead of relying on a single measure.
Reusing boxes is fine when they are clean and rigid; discard any with soft corners or old labels. Our post on eco-friendly packing covers reuse and the trade-offs.
Assorted Corrugated Shipping Boxes
Look for sizes matched to your usual shoes, books and small goods, and for boxes that store flat until needed.
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An Item-by-Item Cheat Sheet
| Item | Usual choice | Notes |
|---|---|---|
| Sweaters, jeans, tees | Poly mailer | Sealed inner bag when the weather is wet |
| Dress shoes, boots, sneakers | Box | Stuff with paper to keep shape; tape well |
| Paperback books, DVDs | Bubble mailer | Add a stiff board if the item must not bend |
| Hardcover books | Box | Pad the corners; see the media shipping post |
| Hats and structured bags | Box | Fill the crown or interior to hold shape |
| Small jewelry | Small box inside a bubble mailer | The box protects; the mailer cushions |
| Glass and ceramics | Box with padding all around | Consider double-boxing |
| Electronics | Box | Original packaging helps |
For vinyl, books and other media, see our post on shipping books and vinyl. For a scale that helps you test weight and cost across options, see choosing a shipping scale.
Common Packaging Mistakes
- Oversized boxes with loose fill. Items shift and corners crush. Use a box that fits and pad the gaps.
- Thin mailers for hard objects. A buckle, heel or corner can push through.
- Weak taping. Tape every seam and edge, not only the middle strip.
- Reusing worn boxes. Soft corners and old labels cause both damage and carrier confusion.
- Skipping the inner bag. A bag costs little and protects against moisture in any outer package.
Cost and Storage: The Tiebreakers
Only after protection is settled should cost enter the picture. Weight and package size can both affect postage, so price the same item in two package types using your carrier's current calculator rather than guessing. Mailers store flat and take little space; boxes need room, though flat-pack boxes help. Keep a few sizes of each rather than a huge range. Standardizing on a handful of sizes keeps your desk simple and your reordering easy.
Tape Dispenser for Sealing Boxes
A reliable dispenser speeds up box sealing, and wide tape on every seam makes a firmer package.
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Frequently Asked Questions
Is a poly mailer safe for fragile items?
No. Poly mailers offer little crush or impact protection. Use a box with padding for fragile or rigid items.
When is a bubble mailer enough?
For light, smaller items that need cushioning from scuffs and light knocks, such as paperbacks, DVDs and boxed small accessories.
Do boxes cost more to ship than mailers?
It depends on weight, size and carrier rules. Price the same item both ways using your carrier's current calculator.
Should I put clothing in a box?
Usually a poly mailer is enough, but use a box for bulky, valuable or shape-sensitive pieces.
Can I reuse boxes?
Yes, if they are clean, rigid and free of old labels. Replace any with soft corners or damage.