Green Mailing Bags 15×18" (381×457 mm) made from 60 µm, 100% recycled LDPE (code 4). These eco self-seal postal bags are moisture-proof / water-resistant, fully opaque for privacy and built for daily dispatch. Trusted by UK online sellers with bulk discounts available. Used by brands on eBay, Amazon, Etsy, Shopify and TikTok Shop.

The sustainable choice for bulkier apparel and multi-item orders: reduce packaging waste, keep postage low and present a clean, professional brand look without custom print.

Not the size you need? See all Green sizes.

Strong 60 µm Eco Postal Bags – Green 15×18"

This size pairs a premium recycled film with a fast peel-and-seal strip for a permanent, tamper-evident closure. The lightweight build supports cheaper bands while giving the strength buyers expect from strong self-seal postal bags and eco mailers.

Why this 15×18" size?

15×18" adds room over 12×16" for jackets, chunky knitwear and multi-item apparel bundles. It protects seams from stretching and avoids stepping up to very large bags. The bold green film underlines your eco message while keeping parcels tidy at the door.

Real use examples

• Winter jacket or thick hoodie with jeans
• 3–5 T-shirts folded with tissue
• Small boxed gifts or merch (pad sharp corners)
• Soft textiles, returns packs, warehouse re-ships

Fit & packing guidance

Best internal fit up to approx. 360×430×80 mm. Choose the smallest bag that closes flat across the seal. If the adhesive lip lands on a bulge, move up to 17×22". For slimmer orders, step down to 12×16". Press out trapped air and add simple corner pads for boxed goods.

Key benefits

• Eco premium: 60 µm film from 100% recycled LDPE (code 4)
• Moisture-proof / water-resistant for everyday courier handling
• Fully opaque green for privacy and a clean, sustainable look
• Fast peel-and-seal – permanent, tamper-evident bond (no tape needed)
• Lightweight – helps reduce postage versus cartons
• Recyclable at carrier-bag return points (LDPE code 4)

Available pack sizes

• Pack of 100 – boutiques and small sellers
• Pack of 300 – steady weekly dispatch
• Pack of 500 – growing multi-channel stores
• Pack of 1000 – lowest unit cost for fulfilment teams

Specifications

Eco & materials

Co-extruded recycled LDPE balances strength with a lower material footprint than virgin plastic of the same gauge. These bags are not biodegradable or compostable; please recycle via carrier-bag return schemes where available.

Strength & protection

60 µm film resists scuffs, tears and punctures better than economy grades. The adhesive forms a tamper-evident seal that stays shut through sorting and last-mile delivery. The deep green film is fully opaque for buyer privacy.

Storage & performance

Store flat at 13–21 °C away from heat and sunlight. If stock arrives cold, allow it to reach room temperature before use for a consistent seal.

Lightweight = lower postage

Mailers cut dead weight and help keep parcels within cheaper bands for Royal Mail, Evri and other couriers. Use a slim inner box only when sharp edges or presentation require it.

Size comparison

Packing tips

• Fold garments to a neat rectangle; keep the seal area flat
• Press out trapped air to reduce size and weight
• Add card/bubble only for sharp corners or gift presentation
• Use a document wallet for external paperwork

Related sizes & essentials

Same-colour sizes: 12×16" • 17×22"
Useful ranges: Mailing Bags • Document Wallets • Packaging Tape • Cardboard Boxes

Order today for fast UK delivery. Trade pricing available on higher volumes.

Frequently Asked Questions