# Gray poly mailers, 10 × 13 in, 100 pack > A light poly mailer at about 8 to 15 cents each, for folded clothing. - Mailers, Best value - Typical UK price: $8 to $15 (a typical band, not a live price) - Platforms: Whatnot, eBay, Vinted, TikTok Shop, Depop, Etsy, Facebook Marketplace, Mercari, Poshmark - Orders a week: 0–2000 - Checked October 7, 2026 Self-seal poly mailers add almost no weight, so one garment usually ships at the lightest Ground Advantage tier. The film is opaque gray, so it hides the contents, and a 4 × 6 label sits flat on it. ## Kit rankings - #1 in [Best poly mailers, bubble mailers and card mailers](https://sellersetups.com/us/kit/mailers) ## Setups - [Baby clothes bundle setup for Poshmark, Mercari and eBay](https://sellersetups.com/us/setups/baby-clothes-age-band-bundles): Eight tubs labeled by size, a rail for snowsuits and coats, and poly mailers that take a 3 to 6 months bundle in one package. - [Whatnot clothing setup for live shows and TikTok Shop](https://sellersetups.com/us/setups/clothing-live-show): A rail, a tripod at eye height and soft light: the spare-room kit for selling women’s fashion and vintage live, then packing the sold pieces the next day. - [Garage setup for 150 to 300 orders a week](https://sellersetups.com/us/setups/garage-150-orders): The step up from a spare room: a garage with picking shelves, two packing tables and a printer built for volume. - [Golf club and sportswear setup for eBay and Depop](https://sellersetups.com/us/setups/golf-clubs-sportswear-garage): Single irons in cut-down boxes, retro jerseys and tennis tops in poly mailers, and a garage split into a clubs side and a clothing side. - [Halloween costume and decor rush from a garage](https://sellersetups.com/us/setups/halloween-costume-garage-rush): Used costumes, props and decorations sold on Mercari, eBay and Depop in a six-week October peak, then stored dry until next year. - [Outdoor gear setup for a shed or garage, eBay and Whatnot](https://sellersetups.com/us/setups/outdoor-gear-shed-seasonal): Tents pitched in the yard before listing, tackle sold live in lots, and a floor scale for the family tent that needs a bigger box and a carrier quote. - [Squishy toy live shows from a bedroom corner](https://sellersetups.com/us/setups/squishy-live-corner): Needoh-style squeeze toys sold in fast Whatnot and TikTok Shop shows, packed in padded envelopes from one desk and three tubs. - [Wholesale pallet setup for TikTok Shop and eBay](https://sellersetups.com/us/setups/wholesale-pallets-tiktok-ebay): New overstock bought by the pallet, sold in live bursts on TikTok Shop and steadily on eBay, packed from a two-table line in a two-car garage. ## Folded clothing on Poshmark, Mercari and eBay Gray poly mailers suit clothing orders on Poshmark, Mercari, Depop and eBay. A folded tee or a pair of jeans slides into a 10 × 13 inch mailer, you press the strip closed, and the package weighs barely more than the garment. They also carry plush toys, pet beds and other items that survive being squashed. ## Mailer size, film thickness and seal strip Match the mailer size to your folded items. Ten by 13 inches takes one folded adult garment; a bulky hoodie or jacket needs a 12 × 15.5 or 14.5 × 19 inch mailer. Film thickness is listed in mils. Around 2 to 2.5 mil resists tearing on sorting belts and sharp corners. The film should be opaque, with a permanent peel-and-seal strip that tears the mailer if someone opens it. A thermal label sticks well to the matte gray outside, or you can write on it in marker. Some packs add a second strip for returns. ## Packing a clothing order Fold the garment to the mailer size and slide it in. Add a sheet of tissue paper first for a neat reveal. Press the air out before you peel the strip and seal, so the package sits flat. Put the label on the flattest part of the front, away from the seal flap. Weigh the sealed mailer to the ounce before you buy a label, because Ground Advantage prices step up by weight, and a few ounces over a tier costs more. Keep the mailers in an open box or a wall dispenser next to the folding area. ## Paper mailers, padded envelopes or a box Recyclable paper mailers cost more each and go in curbside paper recycling. Pick them if your shop promises low-plastic packaging. Fragile, flat or valuable items need more structure. Use a padded envelope for small items that need cushioning, and a small box for boxed goods that would crush. ## About 8 to 15 cents a mailer A pack of 100 mailers costs $8 to $15, so each order carries 8 to 15 cents of packaging. That suits low-priced clothing, where a few cents of packaging is a visible share of the margin. Buy a larger size once you list jackets and sweaters. A thick knit forced into a 10 × 13 mailer splits the seam in transit. ## Common mistakes - Order a larger size for knits and jackets. - Folding a garment wider than the mailer, so the seal strip catches fabric and won't close. - Choosing a mailer far too big for the garment, so it slides about and the spare film snags. - Ship fragile items in a padded envelope or a box. - Choose thick opaque film: clear or thin mailers show the contents and tear on belts. ## Guides - [Kids' clothes bundles and baby items not to resell](https://sellersetups.com/us/guides/baby-items-you-should-not-resell): How to build kids' clothes bundles that sell, and the baby items US safety agencies warn about: used car seats, crib bumpers, inclined sleepers and more. - [Best time to sell on Whatnot, eBay and Poshmark](https://sellersetups.com/us/guides/best-time-to-sell): When toys, back-to-school, Halloween and holiday stock sell, plus Whatnot show times, Poshmark sharing and eBay auction end times. - [How to ship sneakers without a box](https://sellersetups.com/us/guides/post-trainers-without-box): Lost the shoebox or bought the pair loose? Stuff, wrap and pack sneakers so the toe box keeps its shape and the buyer opens a clean pair. - [Whatnot fees, Poshmark and eBay: what sellers keep](https://sellersetups.com/us/guides/reseller-earnings-maths): US fees on Whatnot, Poshmark and eBay, worked examples of profit per item after shipping and packaging, and the levers that change what you take home. - [The July 2026 USPS under-1-lb change for sellers](https://sellersetups.com/us/guides/usps-under-1-lb-change): Since July 12, 2026, commercial Ground Advantage dropped its ounce tiers under a pound. What it costs card, jewelry and accessory sellers, and how to adjust. ## Questions ### What fits in a 10 × 13 inch poly mailer? One folded adult tee, shirt or pair of jeans. Bulky knits and jackets need a larger mailer. ### Are poly mailers waterproof? The film keeps rain off the contents, and the strip seals the opening. Seal it fully and keep the label off the flap. ### Can I reuse a poly mailer? With an intact strip, or a new one added, yes. A resealed old mailer looks used, so save reuse for returns and your own shipments. ### Gray poly or paper mailers? Gray poly costs less each and resists rain. Paper suits shops that want plastic-free packages and curbside recycling. ### Can I use one for a Poshmark label? Yes. Poshmark sends a prepaid label; check its current weight limit in the Poshmark help center.