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15x18 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels

Size Guide

15x18 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels
Product Title: 15x18 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels
Lowercase: 15x18 inch grey plastic postage bags - mailing bags for parcels
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15x18 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels

15x18 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels

Size Guide

15x18 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels
Product Title: 15x18 Inch Grey Plastic Postage Bags - Mailing Bags for Parcels
Lowercase: 15x18 inch grey plastic postage bags - mailing bags for parcels
Show Bag SVG: false
Show Cardboard Box: false
Regular price £8.00
Next Day Delivery
Same Day Dispatch

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Product Description

Grey Mailing Bags 15x18 Inch

Our 15 x 18 inch grey mailing bags strike a perfect balance between medium and large sizes, offering flexibility for a wide range of packaging needs. Made from tough, puncture-resistant polythene, they provide excellent protection from weather, tears, and tampering.

The opaque grey design keeps contents private while giving a clean, professional appearance. A peel-and-seal adhesive strip saves time and removes the need for tape or labels. This size is especially popular for posting folded jeans, thick jumpers, boxed items, and documents in folders—perfect for online retailers and fulfilment teams that value efficiency and reliability.

Product Features

  • Dimensions: 15 x 18 inches (381 x 457 mm)
  • Material: Robust 50-micron polythene
  • Seal: Reliable self-seal adhesive strip
  • Protection: Waterproof and resistant to tears
  • Use Cases: folded jeans, thick jumpers, boxed items, toys, towel sets, 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
Features
FAQs
Shipping

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

Reviews

Customer Reviews

Based on 40 reviews
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M
Michelle Morris
Some Weak Seals

MR Bags always deliver great service and the postage bags are decent. I gave 4 stars because a few bags seemed to have a weaker seal than usual, though most were fine.

M
Michael Benson
Great Customer Service

Customer service was brilliant, sorted my query with no fuss

A
Albert Foster
Good Size Range

Ordered 300 postal bags, great size variety and strong plastic

S
Sophie Thompson
Regular Purchase

Ordered grey mailing bags before and will keep doing so

D
Dr. Mark Johnson
Better Than Shops

I used to buy postage bags from local shops, but they don’t compare to these. These are stronger, cheaper in bulk, and arrive quickly. I’ve already recommended them to a few friends who run businesses too.