Grey Mailing Bags 12×16" (305×406 mm) – near-A3 capacity, fast to pack, everyday tough

Grey mailing bags 12×16" (305×406 mm) give extra room for thicker apparel and small boxes while keeping parcels lightweight. They’re made from tough 60-micron LDPE with a self-seal strip for quick closes. The film is moisture-proof (water-resistant) and opaque to protect privacy from warehouse to doorstep.

Need a different fit? See all sizes or browse the full Mailing Bags range.

Why this 12×16" size?

It’s the sweet spot when 10×14" starts to feel tight. The 12×16" footprint suits hoodies, jeans, knitwear bundles, A4+ packs, and small shoe boxes without jumping into heavier postage bands. Neutral grey stays tidy in transit and hides contents for a clean, professional presentation.

Who it’s ideal for

• Apparel & fashion: hoodies, jeans, sweat sets, knitwear bundles.
• Shoes & accessories: compact shoe boxes, belts, caps, scarves.
• Print & stationery: A4+ folders, catalogues, planners with inserts.
• Beauty & gifts: boxed cosmetics and small gift sets with inner wrap.
• Marketplace sellers: fast, reliable packing for mixed-size orders.

Fit & packing guidance

• Best fit: hoodies, jeans, A4+ bundles, compact shoe boxes, multi-item clothing.
• If it’s slimmer: step down to 10×14" to cut void space.
• If it’s bulky: step up to 15×18".
• Corner care: pad sharp inner-box corners to reduce punctures.
• Flatten air: press out air before sealing so labels sit flat and parcels stack neatly.

Key benefits

• Self-seal, tamper-evident closure for rapid packing.
• 60-micron co-extruded film helps resist tears and punctures.
• Moisture-proof / water-resistant outer for wet weather routes.
• Opaque grey for privacy and a clean, uniform look.
• Lightweight versus boxes — save on postage and storage space.
• Recyclable LDPE — remove the glue strip before recycling.

Specifications

Eco & Materials

Material: 100% recycled LDPE (resin code 4), co-extruded for strength and opacity. Recyclable in many UK schemes — please remove the adhesive strip first. These bags are not biodegradable or compostable.

Strength & Protection

60-micron co-extruded film is puncture- and tear-resistant and moisture-proof. The self-seal, tamper-evident all-season adhesive forms a permanent bond once pressed, keeping contents secure from dispatch to delivery.

Storage & Performance

Store bags at 13–21 °C and out of direct heat or sunlight. Let cold stock acclimatise to room temperature before use to maintain adhesive performance.

Lightweight = Lower Postage

Our recycled LDPE mailers are exceptionally lightweight, helping you keep parcels in lower weight bands versus boxes — a simple way to cut postal costs without losing protection.

Size comparison (pick the best fit for each order)

For a tidy fit across order profiles, keep 10×14" on hand for slimmer items and 15×18" for bulkier picks.

Packing tips to save time and reduce damages

• Use a light inner sleeve for dusty or powder-prone items.
• Fold garments flat; avoid hard creases that create sharp corners.
• Apply labels on a smooth, clean area; press firmly for reliable scanning.
• ... Add invoices/returns in a clear document wallet on the outside.

FAQs

Does 12×16" fit hoodies and jeans?

Yes — it’s sized for thicker apparel and small shoe boxes while staying lightweight.

Are these bags waterproof?

They’re moisture-proof / water-resistant and help protect against rain and splashes. For very wet routes, add an inner sleeve.

Are they recyclable or biodegradable?

They are recyclable in many UK schemes — please remove the glue strip first. They are not biodegradable or compostable.

What thickness is this size?

This 12×16" bag is produced at 60 µm for strength with low weight.

How should I store them?

Keep stock between 13–21 °C and out of direct heat/sunlight. Let cold packs acclimatise before use.

Build a complete packing setup

Team your grey mailing bags 12×16" with packaging tape for any inner cartons, Document Wallets for paperwork, and cardboard boxes when rigid protection is needed. For more colours and sizes, see the full Mailing Bags collection.