100 Mixed Grey Mailing Bags – 4 Sizes, Self Seal Parcel Bags

One pack > Four sizes > Always the right bag to hand.

Get 100 self-seal grey poly mailers — 25 bags at 6×9", 9×12", 10×14", and 12×16" — so you're covered from small accessories right through to folded clothing.

Running an online shop, dispatching eBay or Etsy orders, or just need a reliable stack of postal bags to hand? This 100-pack of mixed grey mailing bags gives you four of the most-used dispatch sizes in a single order, so you're never hunting for the right bag at the wrong moment.

Each bag is made from opaque 60-micron polythene film — robust enough to handle UK postal sorting and courier handling, yet lightweight enough to keep your parcel weights down. The grey exterior is professional and fully opaque, keeping contents private whether you're sending a gift, a business order, or a personal parcel.

The permanent peel-and-seal strip closes in seconds. Once sealed, the bag has to be torn to open — making tampering obvious and giving both you and your recipient confidence from the moment you hand it over.

With 25 bags in each of the four sizes, this mixed pack is built for flexibility. Instead of buying four separate packs and managing four different stock levels, you've got a practical, balanced selection that handles most everyday dispatch needs in one go.

Features and benefits

• 60-micron opaque polythene film — thick enough to protect contents and keep them out of sight; light enough to avoid inflating your parcel weight
• 4 sizes in one pack: 6×9", 9×12", 10×14", 12×16" — covers everything from small jewellery and accessories to folded clothing, without needing multiple separate orders
• 25 bags per size, 100 total — a balanced, ready-to-use set designed for varied daily dispatch volumes
• Permanent self-adhesive peel-and-seal closure — seals firmly in one motion; no moisture, heat, or tools required
• Tamper-evident design — once sealed, the bag must be torn to open it; any interference is immediately visible at delivery
• Water and dirt resistant — contents stay dry and protected even if parcels are left on doorsteps or handled in damp conditions
• Lightweight construction — minimises parcel weight to help keep postage costs low
• Versatile use — ideal for clothing, soft toys, books, stationery, accessories, gifts, and other non-fragile items

Technical specifications

Frequently asked questions

How many bags of each size do I get?
The pack contains 100 bags split equally across four sizes: 25 × 6×9", 25 × 9×12", 25 × 10×14", and 25 × 12×16".

What types of items can I send in these bags?
These bags are well suited to clothing, folded soft goods, books, accessories, stationery, gifts, and other non-fragile items. For sharp, rigid, or fragile contents, use additional inner packaging — the bags themselves are not padded or rigid.

Are the bags waterproof?
They are water-resistant: the 60-micron film and sealed closure protect contents from rain and damp handling during normal postal delivery. They are not intended for prolonged exposure to water.

How does the self-seal closure work?
Peel back the adhesive strip along the top flap, fold it down, and press firmly. The bond is permanent — the bag cannot be reopened without visibly tearing it, which makes tampering obvious to both you and your recipient.

Are these bags suitable for eBay, Etsy, or marketplace selling?
Yes — the mixed-size format is particularly practical for marketplace sellers who ship varied items. Having all four sizes in one pack removes the need to manage separate stock of different bag sizes.

Are the bags recyclable?
The bags are made from polythene (polyethylene), which is accepted at many UK supermarket soft plastic recycling collection points. Check your local scheme for guidance.