Blue Mailing Bags 15×18" (381×457 mm) – Premium Strong 60 µm Self-Seal Postal Bags for e-commerce Shipping
Blue Mailing Bags 15×18" (381×457 mm) – Premium Strong 60 µm Self-Seal Postal Bags for e-commerce Shipping
Blue Mailing Bags 15×18" (381×457 mm) made from 60 µm, 100% recycled LDPE (code 4). These self-seal postal bags are moisture-proof / water-resistant, fully opaque for privacy, and sized for bulkier e-commerce orders. Trusted by UK online sellers on eBay, Amazon, Etsy and Shopify; bulk discounts available.
Not the size you need? See all sizes.
Strong 60 µm Eco Postal Bags – Blue 15×18"
Durable co-extruded 60 µm film resists tears and punctures, while the permanent peel-and-seal saves time and tape. The opaque blue finish gives a clean, professional look that stands out at the doorstep without the cost of custom print.
Why this 15×18" size?
15×18" is the everyday “large order” choice. It fits jackets, thicker hoodies, multi-item apparel bundles and small boxed gifts with room to spare, helping you avoid overfilling smaller bags. It also keeps parcels flatter than cartons, which helps with postage bands and storage.
Real use examples
- Jackets, hoodies + joggers sets
- Multi-item clothing orders or returns
- Small boxed gifts, subscription kits
- Soft homeware (throws, cushions in slim boxes)
Fit & packing guidance
Best for contents up to approx. 360×440×80 mm. If tight, step up to 17×22"; if there’s spare space, step down to 12×16". Pad sharp inner-box corners and press out air for flatter parcels and cleaner labels.
Concerned about splitting? The 60 µm co-extruded film resists bursts and corner tears even when packed full. It’s built for thicker clothing, multi-item orders and courier handling.
Key benefits
- Strong self-seal – permanent, tamper-evident bond
- 60 µm recycled LDPE – tear/puncture resistance
- Moisture-proof / water-resistant outer
- Opaque blue – privacy and brand presence
- Lightweight – helps reduce courier/Royal Mail costs
- Recyclable LDPE (code 4) – return-to-store schemes
Eco & Materials
Made from 100% recycled LDPE to cut virgin plastic use. Not biodegradable or compostable. Recycle via supermarket soft-plastic collection points (remove the glue strip).
Strength & Protection
Co-extruded film helps resist punctures and splits. The tamper-evident adhesive adds security, and the fully opaque finish protects buyer privacy.
Professional, opaque blue finish. The coloured film hides contents completely and gives parcels a tidy, branded look that stands out in delivery photos and customer unboxing shots.
Storage & Performance
Store flat between 13–21 °C and out of direct sunlight. Allow cold stock to acclimatise before sealing for best adhesive performance.
Lightweight = Lower Postage
Mailing bags weigh less than cartons, helping you stay in lower weight bands while protecting soft goods and slim boxed items.
Size comparison
| Option | Size (in + mm) | Typical fit |
|---|---|---|
| Step down | 12×16" (305×406 mm) | Hoodies, jeans, small boxes |
| This page | 15×18" (381×457 mm) | Jackets, multi-item apparel |
| Step up | 17×22" (432×559 mm) | Bedding, coats, bulkier soft goods |
Packing tips
- Fold garments and level bulky areas
- Press out air before sealing
- Pad inner-box corners
- Use a document wallet for labels/paperwork
Related sizes & essentials
Same colour sizes: 10×14" • 12×16" • 17×22"
Essentials: Mailing Bags • Document Wallets • Packaging Tape • Cardboard Boxes
Order today for fast UK delivery and bulk savings on daily dispatches.
| Material | LDPE (code 4) |
| Size | 15x18 Inch (381x457 mm) |
| Color | Blue |
| Closure | Peel-and-Seal (Permanent) |
| Recyclability | Return to Supermarket Soft-Plastic Points |
| Thickness | 60 µm |
| Water Protection | Water-Resistant |
What can I fit in a 15×18" blue mailing bag?
Will a 15×18" mailing bag split if it’s packed full?
Why choose blue mailing bags instead of standard grey?
Are 15×18" blue mailing bags waterproof?
Do these 15×18" mailing bags have a self-seal strip?
Are 15×18" blue mailing bags recyclable?
Are the 15×18" bags fully opaque for privacy?
Can I use the 15×18" blue mailing bag with Royal Mail and UK couriers?
How should I choose between 12×16" and 15×18" mailing bags?
How should I store the 15×18" blue mailing bags?
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