Mailing Bags Shipping Courier Packaging Fliers Self Seal

Grey Self-Sealing Poly Mailer Courier Bags (Co-Extruded Mailing Bags)
Product Description

Each mailing bag features a clean grey exterior that provides an ideal surface for writing addresses, applying shipping labels, barcodes, courier stickers, or company branding. The opaque black, silver, or dark grey interior layer prevents the contents from being seen, ensuring maximum privacy and confidentiality throughout transit.

Supplied in a compact rolled bundle, the bags are secured with a temporary red retention band for convenient storage, organisation, and easy dispensing.

Ideal for e-commerce sellers, online retailers, warehouses, offices, courier services, and home businesses, these mailing bags offer a fast, secure, and professional packaging solution for a wide range of products.

Permanent Self-Sealing Adhesive Closure
Each bag features a high-tack peel-and-seal adhesive strip that creates a permanent bond once sealed.
No additional tape required
Fast packaging process
Strong hot-melt adhesive
Tamper-evident security
Cannot be opened without visibly damaging the bag
Perfect for ensuring parcels remain securely sealed during shipping.

Waterproof & Weather Resistant
Designed to protect your shipments from harsh delivery conditions.

Provides protection against:
Rain
Moisture
Snow
Dirt
Dust
Humidity
Splashing water
Helps keep contents clean, dry, and protected throughout transportation and storage.

Excellent Privacy Protection
The opaque multi-layer construction completely conceals package contents.
The dark inner lining prevents transparency, making these bags ideal for shipping:
Clothing
Documents
Personal items
Retail products
Confidential materials

Strong Side Seams
Heat-sealed reinforced seams provide additional durability during transportation.
Designed to withstand:
Conveyor belts
Warehouse handling
Courier sorting
Long-distance shipping
Everyday delivery conditions

Easy to Label
The smooth white outer surface is specially designed to accept:
Shipping labels
Thermal labels
Barcode stickers
Address labels
Courier documentation
Permanent marker writing
Company branding labels

Compact Roll Packaging
Supplied as a tightly rolled bundle that saves storage space and keeps bags neatly organized.

Benefits include:
Easy storage
Convenient dispensing
Reduced warehouse clutter
Quick access during packing

Why Choose Poly Mailers Instead of Cardboard Boxes?
Faster Packing

No box assembly required.

Simply:
Insert the item.
Remove the adhesive liner.
Fold the flap.
Press firmly to seal.
Packaging takes only seconds.

Lower Shipping Costs
Unlike bulky boxes, poly mailers are lightweight and flexible, helping reduce postage costs while maintaining excellent protection.

Less Packaging Material
No need for:
Packing tape
Bubble wrap (for suitable items)
Void fill
Packing peanuts
Air pillows
This simplifies packing and reduces packaging waste.

Better Water Resistance
Unlike paper envelopes or cardboard cartons, polyethylene mailers resist moisture and protect contents from wet weather during transit.

Greater Durability
The flexible co-extruded film stretches under pressure instead of tearing easily, making it highly resistant to punctures, abrasions, and rough courier handling.

Ideal For Packaging
Perfect for shipping:
Clothing
T-shirts
Dresses
Jackets
Hoodies
Baby clothes
Shoes (soft packaging)
Documents
Books
Cosmetics
Beauty products
Jewellery boxes
Mobile phone accessories
Electronics accessories
Office supplies
Toys
Gifts
Handmade products
Online marketplace orders
E-commerce parcels


Product Specifications
Feature                Specification
Product Type        Self-Sealing Poly Mailer Bags
Material        Premium Multi-Layer Co-Extruded Polyethylene (PE/LDPE)
Construction        Three-Layer Co-Extrusion (PO + PE + PO)
Exterior Colour        Grey
Interior Colour        Black, Silver, or Dark Grey (Opaque)
Finish                Smooth Glossy Surface
Closure                Permanent Peel-and-Seal Hot Melt Adhesive Strip
Waterproof        Yes
Tear Resistant        Yes
Puncture Resistant Yes
Moisture Resistant Yes
Dust Resistant        Yes
Tamper Evident        Yes
Recyclable        Yes (where recycling facilities accept LDPE)

Available Sizes
Available in multiple size options to suit different shipping requirements.
Typical sizes include:
20×30cm – Suitable for jewellery boxes, books, cosmetics, and small garments.
20×35cm – Ideal for T-shirts, documents, and fashion accessories.
25×35cm – Suitable for sweaters, shirts, and medium-sized apparel.
32×48cm – Perfect for coats, bedding, blankets, and bulk clothing.

Available Variants
Size                     Pack Quantity
20×30cm             25pcs / 50pcs / 100pcs
20×35cm             25pcs / 50pcs / 100pcs
25×35cm             25pcs / 50pcs / 100pcs
32×48cm             25pcs / 50pcs / 100pcs

Thickness
Typical film thickness:
Approximately 50 microns (50μ / 2.0 mil) for light-duty applications.
The multi-layer construction provides outstanding strength despite its lightweight design.

Benefits
Premium three-layer co-extruded polyethylene construction
Strong permanent self-sealing adhesive
Waterproof and weather-resistant
Opaque interior for maximum privacy
Lightweight to reduce postage costs
High tear and puncture resistance
Reinforced side seams for added strength
Smooth surface for labels and handwriting
Compact rolled packaging for easy storage
Professional appearance for business shipments
No additional tape required
Suitable for personal and commercial use
Recyclable material

Why You'll Love It
Whether you're an online seller, warehouse operator, or simply sending parcels to family and friends, these White Self-Sealing Poly Mailer Bags provide a professional, secure, and cost-effective packaging solution. Their lightweight yet durable multi-layer construction, permanent tamper-evident seal, waterproof protection, and opaque privacy layer ensure your parcels arrive safely while helping reduce shipping costs and improve packing efficiency.

Storage
Store in a cool, dry place below 30°C.

Camera Light: This product is taken in kind, but due to the different camera light, display and personal colour, the existing chromatic aberration problem is inevitable.

If you have any other questions about this item, please feel free to contact us at  laststopsupermart@gmail.com. Our after-sales team will reply to you within 24 hours

Package Content depending on option selected below: 
Package Include:1 x 20x30cm 25pcs
Package Include:1 x 20x30cm 50pcs
Package Include:1 x 20x30cm 100pcs

Package Include:1 x 20x35cm 25pcs
Package Include:1 x 20x35cm 50pcs
Package Include:1 x 20x35cm 100pcs

Package Include:1 x 25x35cm 25pcs
Package Include:1 x 25x35cm 50pcs
Package Include:1 x 25x35cm 100pcs

Package Include:1 x 32x48cm 25pcs
Package Include:1 x 32x48cm 50pcs
Package Include:1 x 32x48cm 100pcs