What size poly mailer do you need for a T-shirt, hoodie, or other clothing order? Start with the garment after it has been folded for shipping. Measure the folded bundle, allow room to slide it into the mailer and close the seal, then test the packed order before buying a large quantity. Clothing size labels alone cannot tell you which mailer will fit.
This guide gives small ecommerce teams a repeatable way to choose mailer sizes without forcing every apparel order into one bag.
When is a poly mailer suitable for clothing?
A standard poly mailer is best for soft, flexible items that do not need rigid protection: a folded T-shirt, leggings, a scarf, or similar apparel. It keeps the outer package light and stores flat at the packing station. A mailer does not protect against crushing, so use a corrugated box if an order includes shoes, a rigid accessory, a gift box, a fragile item, or several products that need separation.
Still choosing between outer packages? Read our shipping boxes vs. poly mailers guide.
How to measure clothing for a poly mailer
- Fold the actual order. Use the same folding method your team will use during fulfillment. Add any tissue, insert, or inner bag that normally ships with it.
- Measure the packed bundle. Record its width, length, and thickness. Measure the largest points without compressing the product unnaturally.
- Check the mailer's usable space. A listed flat size is not always the space available after a bulky item is inserted. Seams and the adhesive flap also take up room.
- Test the fit. Slide the bundle in without forcing it. The flap should close fully and lie flat. The finished package should have no strained seams or exposed product.
- Label and review the packed mailer. Make sure the shipping label fits on a flat surface and the packed dimensions match what you enter when buying postage.
For example, a folded shirt measuring about 9 × 7 × 1 inches may fit a mailer listed as 10 × 13 inches, but the usable fit depends on the bag design and how thick the bundle becomes. Treat size examples as a starting point and pack a sample order before standardizing a mailer.
Why thickness matters as much as length and width
A flat mailer has two dimensions on the product listing, but a thick hoodie or multi-garment bundle uses space in both directions when inserted. A bag that looks wide enough on the table may become too short for the flap to close. Choose the size from a packed sample, not just a flat measurement of the fabric.
If the next mailer size leaves a lot of loose space, compare another fold pattern or consider a box. Oversizing can also affect parcel dimensions. Our dimensional weight guide explains why the finished package size matters.
Match the outer package to the order
- Single soft garment: Test a standard opaque poly mailer with enough room for a full seal.
- Thicker apparel or several garments: Re-measure the completed bundle; a larger mailer or a box may pack more reliably.
- Small item needing light padding: Consider a bubble mailer, then confirm the padding and usable interior still leave enough room.
- Rigid, heavy, or fragile item with clothing: Use a box and suitable protection rather than relying on a flexible mailer.
A clear garment bag can help organize or protect clothing inside an order, but it should not automatically be treated as a carrier-ready outer mailer. Confirm the role of each bag before setting your packing instructions.
Create a simple mailer size test for your team
Pick three to five common orders, such as one T-shirt, one hoodie, two garments, and a soft accessory. Pack each as it would leave your workstation. Record the folded bundle size, the mailer tested, whether the adhesive flap closed comfortably, and the final parcel dimensions. Then keep a short reference list at your packing station.
Warm Fortune Packaging's 10 × 13 opaque white poly mailer is one size you can compare with a sample apparel order. Browse the Mailers & Bags collection for other available options. Check each product's listed dimensions and test fit before ordering for repeat shipments.
A quick apparel-mailer checklist
- The garment is folded and protected as it will be for a real order.
- The packed bundle slides into the mailer without force.
- The adhesive flap closes completely, with no tension at the seams.
- The label sits flat and does not cover the closure.
- The outer package offers enough protection for every item in the order.
- The final weight and dimensions are measured for the shipping service you use.
If your customers may send apparel back in the same bag, choose a return process that matches your policy and the condition of the original package. See our returns packaging plan for a reusable checklist.
Frequently asked questions
What size poly mailer should I use for one T-shirt?
There is no universal size. Fold the actual shirt with any inner packaging, measure the bundle, and test a mailer that leaves room for easy insertion and a secure seal. Fabric weight and folding method change the fit.
Can I ship a hoodie in a poly mailer?
Often, yes, if the hoodie is soft and the packed bundle fits without stressing the seams or closure. Thick hoodies take more space than a T-shirt, so test the finished package rather than relying on the garment's clothing size.
Should I use a bubble mailer for clothing?
Standard poly mailers are often enough for soft, durable apparel. A bubble mailer can add light cushioning for a small item, but it does not replace a box when rigid or fragile goods need structural protection.
How do I choose one mailer size for several apparel products?
Test your most common order combinations and record which size fits each one. Many stores keep a small range of mailer sizes instead of forcing every order into a single bag.
Make mailer sizing repeatable
A short test-fit list helps your team pack clothing consistently and order supplies based on real demand. Start with your most frequent products, review the packed results, and update the list when your products or inserts change. For recurring supply needs, request business pricing with the mailer sizes and quantities you expect to use.