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Grey Mailing Bags | 6 x 9 Inch | Royal Mail Large Letter A5 Size Grey Mailing Bags | 6 x 9 Inch | Royal Mail Large Letter A5 Size £1.49 – £13.29Price range: £1.49 through £13.29
Jewellery Variety Pack Small Items & Jewellery Variety Pack £0.99 – £4.99Price range: £0.99 through £4.99

Grey Mailing Bags | 4 x 6 Inch | Royal Mail Large Letter Size

Professional Shipping Solutions – 4 x 6″ Grey Mailing Bags

What fits in this bag?

  • Small Items: Cosmetics, phone accessories, jewelry pouches, badges, and small components.
  • E-Commerce: Ideal for eBay, Vinted, Depop, and Etsy sellers shipping non-fragile items.

Also available in our mixed size packs

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Grey Mailing Bags | 4 x 6 Inch | Royal Mail Large Letter Size
Grey Mailing Bags | 4 x 6 Inch | Royal Mail Large Letter Size
£0.99 – £6.99Price range: £0.99 through £6.99
Total: £0.00
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Same-Day Dispatch
Orders before 1pm
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Postal Approved
Royal Mail & Small Parcel
🛡️
Heavy-Duty Poly
Tear-resistant & recyclable
Guaranteed Safe Checkout

Grey Mailing Bags | 4″ x 6″ (100x150mm) | Royal Mail Small Items Size

Upgrade your shipping process with these premium 4″ x 6″ (100mm x 150mm) Grey Mailing Bags. Specially sized for compact items, these mailers help e-commerce sellers keep postal dimensions to a minimum while maintaining a sleek, professional presentation.

Why Choose These Grey Mailers?

  • Maximum Postage Savings: Sized specifically for small goods like jewelry, cosmetics, key-rings, and small electronics, ensuring your dispatches stay within the lowest possible postal tiers.
  • 100% Opaque: Built with a dark interior lining that guarantees total privacy and a clean, discreet arrival.
  • Ultra-Strong Protection: Made from durable, co-extruded polymer that resists punctures, tears, and moisture to keep contents completely dry.
  • Tamper-Proof Seal: Features a high-tack permanent self-seal strip that creates an instant bond, showing clear signs if tampered with.

Ideal For:

  • Small Items: Cosmetics, phone accessories, jewelry pouches, badges, and small components.
  • Online Sellers: Perfect for eBay, Vinted, Depop, and Etsy orders requiring lightweight, secure packaging.

Technical Specifications

  • Dimensions: 4″ x 6″ (100mm x 150mm approx)
  • Material: 100% Recyclable LDPE (60 Micron thickness)
  • Closure: Permanent Peel-&-Seal Adhesive Strip
  • Color: Opaque Grey Outer / Dark Inner

Additional information

Weight0.1 kg

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Mailing Bags Size Guide

Packing a t-shirt in a grey mailing bag

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 mmT-Shirts, Leggings, Thin Summer Dresses, A4 DocumentsLarge Letter (if < 25 mm thick)
12 x 16″300 x 400 mmThe “Workhorse”: Hoodies, Jeans, Coats, Small Shoe Boxes, Small BundlesSmall Parcel
16 x 21″400 x 525 mmWinter 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

  1. 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.
  2. 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!
  3. 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.
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