Not sure which bag you need for your Vinted or eBay sales? Use our mailing bags size guide below to find the perfect fit for your items. All our bags are lightweight to help you stay within Royal Mail and Evri weight limits.
Quick Reference Chart
| Bag Size (Inches) | Metric Size (mm) | Best For… | Royal Mail Format |
|---|---|---|---|
| 9 x 12″ | 225 x 300 mm | T-Shirts, Leggings, Thin Summer Dresses, A4 Documents | Large Letter (if < 25 mm thick) |
| 12 x 16″ | 300 x 400 mm | The “Workhorse”: Hoodies, Jeans, Coats, Small Shoe Boxes, Small Bundles | Small Parcel |
| 16 x 21″ | 400 x 525 mm | Winter Coats, Boots, Larger Shoe Boxes, Multi-item “Bundles” | Small/Medium Parcel |
🧥 Which bag for my item?
- T-Shirts & Tops: Most single t-shirts fit perfectly in a 9×12″ bag. If the fabric is very thin, you can often keep this under 2.5cm thick to post as a Large Letter, saving you nearly £2.00 in postage!
- Jeans & Trousers: Adult jeans are bulky. We recommend the 12×16″ bag. It allows room for the denim to be folded without putting stress on the seams.
- Hoodies & Knitwear: For a standard adult hoodie, go for the 12×16″. If it’s an extra-thick “oversized” hoodie or a winter coat, move up to the 16×21″.
- Vinted Bundles: If a buyer has bought 3–5 items, the 16×21″ is your best friend. It’s heavy-duty and large enough to keep everything together in one secure package.
📏 Top Packing Tips for Sellers
- The “Air Squeeze”: Before sealing the bag, press down to remove excess air. This makes the parcel flatter and less likely to get caught in courier machinery.
- The Fold Test: If your item is right on the edge of two sizes, go for the larger one. You can always fold the excess plastic over and tape it down, but you can’t stretch a bag that’s too small!
- Check the Depth: Remember, Royal Mail “Large Letter” is about the thickness (25mm), not just the width. If your t-shirt is folded too “fat,” it will be charged as a Small Parcel.