14x21 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels
14x21 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels
Guaranteed safe & secure checkout
Grey Mailing Bags 14x21 Inch
Efficient, strong, and versatile, our 14 x 21 inch grey mailing bags are built for busy dispatch operations. Manufactured from premium polythene, they’re water-resistant, tear-proof, and lightweight—making them perfect for keeping shipping costs low without compromising protection.
The sleek grey finish looks professional, while the self-seal strip ensures contents stay secure throughout delivery. This size works well for mailing A4-sized products with extra room, or items like thick books, jumpers, or multiple garments. Ideal for businesses looking to pack quickly and ship confidently.
Product Features
- Dimensions: 14 x 21 inches (355 x 533 mm)
- Material: Robust 50-micron polythene
- Seal: Reliable self-seal adhesive strip
- Protection: Waterproof and resistant to tears
- Use Cases: Coats, bulkier clothing, small blankets, A4 size items, etc.
Grey Mailing Bags Size Guides
| Size Guide | Size in Inches | Centimetres | Compared to Paper Sizes | Best For |
|---|---|---|---|---|
| Small | 4.5x7 inch | 11.4 x 17.7 cm | Between A6 and A5 | Small jewelry, USB drives, gift cards |
| Small | 6.5x9 inch | 16.5 x 22.8 cm | Close to A5 | Socks, small cosmetics, phone accessories |
| Small | 9x12 inch |
22.8 x 30.4 cm |
Between A4 and A3 | T-shirts, magazines, documents (Royal Mail Large Letter Size) |
| Medium | 10x14 inch | 25.4 x 35.5 cm | Slightly smaller than A3 | Light jackets, books, larger documents |
| Medium | 12x16 inch | 30.5 x 40.6 cm | Close to A3 | Sweaters, jeans, medium plush toys |
| Medium | 13x19 inch | 33 x 48.3 cm | Larger than A3 | Hoodies, multiple clothing items, larger books |
| Large | 14x21 inch | 35.5 x 53.3 cm | Between A2 and A1 | Coats, bulkier clothing, small blankets |
| Large | 15x18 inch | 38.1 x 45.7 cm | Between A2 and A1 | Multiple garments, larger plush toys |
| Large | 17x24 inch | 43.2 x 61 cm | Close to A1 | Bedding sets, large textiles, posters |
| Extra Large | 20x26 inch | 50.8 x 66 cm | Between A1 and A0 | Large blankets, bulk clothing |
| Extra Large | 21x24 inch | 53.3 x 61 cm | Between A1 and A0 | Oversized garments, multiple items |
| Extra Large | 24x36 inch | 61 x 91.4 cm | Close to A0 | Large posters, art prints, bedding sets |
| Extra Large | 28x30 inch | 71.1 x 76.2 cm | Larger than A0 | Bulk textiles, large cushions |
| Extra Large | 28x34 inch | 71.1 x 86.4 cm | Larger than A0 | Oversized items, multiple large products |
Royal Mail 24 Tracked
Dispatched same day if ordered before 5 pm Monday to Friday. Please allow up to 1-2 days for delivery.
£1.99
DPD Next Day
Dispatched same day if ordered before 3 pm Monday to Thursday. Not available to Scottish Highlands & Islands.
£4.99
Free on orders over £100