Grey Mailing Bags 14×21" (356×533 mm) – Self-Seal Recycled Postal Bags
Grey Mailing Bags 14×21" (356×533 mm) – Self-Seal Recycled Postal Bags
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Grey Mailing Bags 14×21" (356×533 mm) – reliable space for jackets & textiles
Grey mailing bags 14×21" (356×533 mm) give extra room for jackets, thicker knits, textiles and larger A4 bundles while keeping parcels lightweight. Made from 60-micron, 100% recycled LDPE, they’re moisture-proof (water-resistant), opaque for privacy, and close fast with a tamper-evident self-seal strip.
Not the size you need? See all sizes.
Why this 14×21" size?
When 13×19" starts to feel tight, 14×21" adds length and a little width for outerwear, textile sets, and retail boxes that don’t need a rigid carton. If you’re packing bulkier bedding, step up to 17×24". For coats or multi-item bundles, consider 15×18" (wider) or 17×24" (bigger overall).
Real use examples (what typically fits)
- Apparel: jackets, thick knitwear, sweat sets, stacked tees.
- Textiles: throws, cushion covers, towel sets in sleeves.
- Boxed goods: larger books/catalogues, retail kits with padded corners.
Fit & packing guidance
- Best fit: outerwear, textile sets, larger A4 packs, bulkier apparel.
- If it strains at the seal: move up to 17×24".
- If it’s roomy: step down to 13×19" to cut void space and postage.
- Corner care: pad or round inner-box edges to reduce punctures.
- Press out air: flatten before sealing so labels stick flat and sacks stack neatly.
Key benefits
- Self-seal, tamper-evident closure for fast, secure packing.
- 60-micron co-extruded film helps resist tears, splits and scuffs.
- Moisture-proof / water-resistant outer for wet routes.
- Opaque grey for privacy and a clean, professional look.
- Recyclable LDPE — remove the glue strip before recycling.
Specifications
| Spec | Value |
|---|---|
| Size (inches) | 14 × 21" |
| Size (mm) | 356 × 533 mm |
| Thickness | 60 µm |
| Material | LDPE (Low-Density Polyethylene), 100% recycled |
| Closure | Peel-and-seal, tamper-evident |
| Colour | Grey, opaque |
| Water protection | Moisture-proof / water-resistant |
| Recyclability | Recyclable – remove glue strip before recycling |
Eco & Materials
Film: 60 µm, 100% recycled LDPE (code 4). Recyclable in many UK schemes — please remove the adhesive strip first. Not biodegradable or compostable.
Strength & Protection
Co-extruded film for puncture and tear resistance. The self-seal adhesive forms a permanent bond once pressed. The opaque grey finish hides contents and looks tidy on arrival.
Storage & Performance
Store at 13–21 °C out of direct heat/sunlight. Let cold stock acclimatise before use for best adhesive performance.
Lightweight = Lower Postage
LDPE mailers are exceptionally lightweight versus cartons, helping you stay in lower weight bands when the product doesn’t need a rigid box.
Size comparison (choose the right bag)
| Size | Inches | Millimetres | Typical fit |
|---|---|---|---|
| Step down | 13 × 19" | 330 × 483 mm | Bulkier apparel, larger books |
| This page | 14 × 21" | 356 × 533 mm | Jackets, textile sets, larger A4 bundles |
| Step up | 17 × 24" | 432 × 610 mm | Bedding sets, bulkier textiles, larger boxed goods |
Packing tips
- Use a light inner sleeve for dusty items or sharp corners.
- Fold textiles flat; avoid hard creases that form sharp edges.
- Apply labels on a smooth, clean area; press firmly for reliable scanning.
- Add invoices/returns in a clear document wallet on the outside.
FAQs
Is 14×21" big enough for a jacket?
Yes, it suits most jackets and thicker knits. If the seal feels tight, step up to 17×24".
Are these bags waterproof?
They’re moisture-proof / water-resistant. For very wet routes, add an inner sleeve.
Are they recyclable?
Yes — LDPE (code 4). Please remove the glue strip before recycling.
Need a different fit? See all sizes or browse the full Mailing Bags range.
Build a complete packing setup
Team your grey mailing bags 14×21" with packaging tape, document wallets, and cardboard boxes.
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