Plastic Mailing Bags

Waterproof, tear-resistant plastic mailing bags in Light, Medium & Heavy duty strengths. Available in grey, clear & blue, with standard and gusseted styles to suit products of different size, weight & shape.

Light Duty Heavy Duty Gusseted Options Grey / Clear / Blue

Popular choices include the grey mailing bags like 320×420mm Small Parcel, 250×350mm Large Letter, and large-parcels 700×850mm & 717×585mm.

What Are Plastic Mailing Bags?

Also known as poly or plastic shipping bags, these are lightweight, durable envelopes or sachets made from plastic (typically LDPE or similar). They seal with peel-and-seal or adhesive strips, protect against moisture, and allow flexible packaging for irregular items.

Differences Between Light, Medium & Heavy Duty

Light duty is thin, ideal for lightweight clothes, soft fabrics, or documents. Medium duty adds thickness for slightly heavier loads—garments with accessories, small boxed items. Heavy duty plastic bags are thicker, often gusseted, designed for bulk, weight and durability in transit.

Colour, Style & Features

Grey Mailing Bags

Opaque, neutral grey poly will mask content, resist light scuffs, and offer privacy—especially popular with fashion retailers and clothing mailers. Grey poly hides dirt marks better in transit.

Clear & Blue Options

Clear bags are great for product visibility (e.g. when label or product presentation matters), while blue bags often serve as branding accent or colour coding. All options come with strong seals to maintain integrity.

Featured Grey Mailing Bags

Size	Use case	Strength / Duty	Notes
717 × 585 mm	Large parcel items – blankets, bedding, multi-item mixes	Heavy duty	Wide size; thick plastic; ideal for bulky but flat items
700 × 850 mm	Very large flat items or multiple layers/items	Heavy duty	Extra large; check courier size limits
530 × 430 mm	Medium-sized clothing, soft goods, or boxed items	Medium duty	Good balance of cost vs protection
320 × 420 mm	Small parcel – shoes, accessories, small apparel	Medium duty	Cost-efficient; review weight and prints
250 × 350 mm	Large-letter / small mailing – documents, thin products	Light/medium duty	Flatter parcels; avoid heavy bendable items

How To Choose Correct Duty & Style

Match duty (light/medium/heavy) to product weight & expected handling. For flat items, use standard bags; for thicker sets/bulkier goods see padded mailers.

Gusseted styles give more room for bulky or oddly shaped items and help avoid seam stress.

Combine With & Protect Further

Use cardboard sheets or book wraps inside to stiffen flat or fragile item mailings.

For exterior labelling, use Address Labels and Documents Enclosed Wallets to include invoices or packing slips.

Plastic Mailing Bags – FAQs

Typically LDPE or similar poly-plastics with a sealable flap. The thicker (higher gauge) the plastic, the more tear and puncture resistance.

Gusseted bags expand at the bottom or sides when filled. Good for bulky but not fully rigid packages. They help preserve shape and reduce strain on seams when items have depth.

Colour can affect appearance, presentation & privacy. Grey is opaque and hides contents; clear makes contents visible (good for buyers to see product); blue often used for branding or stock-identification. All—with proper duty—maintain durability.

Yes, plastic mailing bags are waterproof and resist rain/splashes far better than paper options. Ensure seals are applied properly, particularly peel-and-seal strips, to keep moisture out.

Many are made from recyclable LDPE (check recycling code). Some local councils or soft plastic collection points accept them. If not, consider reuse or opt for recyclable paper alternatives.

For lightweight clothing, a light duty 250×350mm-320×420mm bag is often enough. For multiple items or padded/twisted things, choose medium/heavy duty in larger sizes like 530×430mm or 700×850mm. Heavy duty for bulky or sharp items.

Don’t overfill. Use the right duty. If shipping something sharp or boxed inside, protect edges with cardboard or use padded mailers. Always press the seal firmly along the full flap length.