Purple Mailing Bags 15×18" (381×457 mm) – Premium Strong Self-Seal Postal Bags for E-commerce Shipping
Purple Mailing Bags 15×18" (381×457 mm) – Premium Strong Self-Seal Postal Bags for E-commerce Shipping
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Purple Mailing Bags 15×18" (381×457 mm) made from 60 µm, 100% recycled LDPE (code 4). These premium self-seal postal bags are moisture-proof, water-resistant and fully opaque for privacy. Built for daily e-commerce use with a fast, permanent seal, they give a stronger, smarter look than standard grey mailers.
Used by clothing brands, subscription services, fulfilment centres and online sellers who want packaging that looks professional and protects orders in transit.
Not the size you need? See all sizes.
Why this 15×18" size?
Compared with 12×16", 15×18" adds the depth and width needed for bulkier garments and multi-item orders. Jackets, thick hoodies, knitwear sets and bundled clothing fit without stretching seams or wrinkling the seal. The bold purple finish lifts brand presentation on Shopify, Etsy, TikTok Shop, Amazon and eBay without the cost of custom print, making this size a reliable choice for peak-season dispatch and returns-friendly packing.
Real use examples
- Winter hoodies, thick jumpers, cardigans and knitwear sets
- Light jackets or gilets with tissue and a returns leaflet
- Two–three apparel pieces packed together (e.g., jeans + hoodie)
- Bulky merch, subscription bundles or gift boxes with corner pads
Fit & packing guidance
Best fit inside: up to approx. 360×430×80 mm. If the adhesive lip lands on a bulge or the parcel feels tight at the corners, step up to a larger size. For slimmer orders, step down to 12×16" to keep packs compact. Add corner pads for sharp edges, and press out excess air before sealing to keep parcels postage-friendly.
Key benefits
- Premium strength 60 µm co-extruded film resists tears and punctures on heavy packs
- Moisture-proof / water-resistant protection for everyday courier handling
- Fully opaque purple for privacy and a clean, branded look
- Fast peel-and-seal – permanent, tamper-evident bond, no tape needed
- 100% recycled LDPE (code 4) – recyclable at carrier-bag return points
- Lightweight – reduces parcel weight versus cartons for lower postage
Available pack sizes
Choose the right volume for your workflow:
- Pack of 100 – starter volume for boutiques and small sellers
- Pack of 300 – efficient for regular weekly dispatch
- Pack of 500 – popular for growing online stores
- Pack of 1000 – best unit cost for high-volume fulfilment
These bulk options are ideal for Shopify, Etsy, Amazon FBA, TikTok Shop and warehouse dispatch operations.
Specifications
| Size | 15×18" (381×457 mm) |
|---|---|
| Film thickness | 60 µm (standardised) |
| Material | LDPE (code 4), 100% recycled |
| Closure | Peel-and-seal, permanent bond |
| Colour | Purple, fully opaque |
| Water protection | Moisture-proof / water-resistant |
| Recyclability | Return-to-store soft-plastic collection (LDPE code 4) |
Eco & materials
Made from 60 µm, 100% recycled LDPE (code 4). Recycled film offers reliable strength with a lower material footprint than virgin plastic of the same gauge. These bags are not biodegradable or compostable; please recycle with carrier-bag return schemes where available.
Strength & protection
Engineered co-extruded film gives a tough, scuff-resistant outer and a secure inner layer for bulky items. The permanent adhesive creates a tamper-evident seal that stays shut through sorting and transit. The deep purple film is fully opaque to protect buyer privacy and improve brand look on arrival.
Storage & performance
Store flat at 13–21 °C away from heat or direct sun. If stock arrives cold, allow to acclimatise to room temperature before use for best sealing performance.
Lightweight = lower postage
Mailing bags reduce dead weight and parcel size compared with boxes, helping you stay within cheaper bands with Royal Mail, Evri, DPD and other couriers. Use a slim inner box only when edge protection or presentation requires it.
Size comparison
| Option | Size (in + mm) | Typical fit |
|---|---|---|
| Step down | 12×16" (305×406 mm) | Hoodie, jeans, tee bundle, gift set |
| This page | 15×18" (381×457 mm) | Thick hoodies, light jackets, multi-item apparel packs |
| Step up | 19×24" (483×610 mm) | Coats, bulky knitwear, large bundles or retail boxes |
Shipping essentials & sizes
- Same colour: 12×16" • 19×24"
- Essentials: Mailing Bags • Document Wallets • Packaging Tape • Cardboard Boxes
Order today for fast UK delivery and dependable, professional packaging.
Frequently Asked Questions
Are these bags moisture-proof?
Yes. The 60 µm co-extruded film is moisture-proof and water-resistant, helping protect parcels in rain and damp conditions.
What material are they made from?
100% recycled LDPE (code 4). It is tough, flexible and fully opaque for privacy, and recyclable at soft-plastic collection points.
What fits in a 15×18" mailing bag?
Typical fits include thick hoodies, knitwear sets, light jackets or multi-item apparel packs. If the seal sits on a bulge, move up to a larger size.
Do I need extra tape?
No. The peel-and-seal adhesive forms a permanent, tamper-evident bond. Add tape only for very heavy or high-value items.
Are they recyclable or biodegradable?
They are recyclable LDPE (code 4) via carrier-bag return schemes. They are not biodegradable or compostable.
How should I store them?
Store flat at 13–21 °C away from heat and direct sun. Let cold stock reach room temperature before use for a reliable seal.
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