White CoEx 100% Opaque Sapphire Poly Tough Mailers

Bags / Mailing Bags / Co-Ex White Mailers

White co-extruded (CoEx) poly mailers are a common choice for shipping soft goods and boxed items where you want a clean presentation and strong privacy. The white outer layer helps create a professional look, while the co-ex construction is designed to improve tear resistance compared with single-layer films. Because these mailers are lightweight, they can help reduce dimensional bulk versus cartons for suitable products.

White CoEx Poly Mailers (Opaque) — Helpful Guide

This collection focuses on opaque white CoEx mailing bags designed for dispatching items through courier and postal networks. They are typically used for apparel, textiles, accessories, printed materials, and other non-fragile goods that do not require rigid protection. The key benefit is opacity: contents are concealed to support privacy and reduce visual theft risk during transit.

Types of packaging in this category

• Opaque white CoEx poly mailers (standard sizes)
  Designed for everyday shipping where you need a lightweight, water-resistant outer layer and a secure closure.
• Lip/flap mailers (self-seal format)
  Mailers with an extended lip/flap area intended for sealing; useful when you want consistent closure placement and easier packing.
• Larger-format mailers for bulkier soft goods
  Wider bags suited to hoodies, multiple garments, or larger textile items where a smaller mailer would be overfilled.

Products available in this collection (with quick use-notes)

Below are the products shown in this category and the typical use-cases they suit. Choose a size that allows your item to sit flat without excessive stretching, and leave room for the closure area.

• No1 229x320+38mm Lip (9x12.5) (A4 Size) - 55mu White CoEx Opaque "Sapphire" Poly Mailers
  A versatile A4-friendly mailer size for folded garments, documents in protective sleeves, and small boxed items. The added lip helps provide a consistent sealing zone.
• No0 175x230 (7x9) - 55mu White CoEx Opaque Sapphire Poly Mailers
  A compact option for smaller items such as accessories, light apparel, or small parts that do not require rigid protection. Using a closer-fitting mailer can reduce movement in transit.
• 16x13 - 400x320 - White Co-Ex White Mailers with WOP
  A larger-format mailer for bulkier soft goods or multiple items packed together. The wider footprint can help avoid overstuffing, which may otherwise stress seams and closures.

Case study: reducing damage and returns for apparel dispatch

A common issue in apparel fulfilment is packaging that is either too small (leading to stretched seams and popped closures) or too large (allowing items to slide and crease). In a typical workflow, switching to a better-matched mailer size and standardising the packing method can reduce in-transit handling issues. For example, using a compact mailer for small accessories and reserving larger formats for multi-item orders helps keep parcels tidy, improves scanability of labels, and reduces the chance of snagging during sorting.

Another frequent improvement is adding a simple internal protection step for items sensitive to moisture or scuffing (such as placing the product in an inner sleeve before inserting into the mailer). While the outer poly mailer provides a water-resistant barrier, an inner layer can help keep products clean during packing and returns processing.

How to choose the correct white CoEx mailer

1) Measure the packed item, not the product

Always measure the item as it will be shipped (folded, bagged, or boxed). If you ship clothing in an inner bag, measure the bagged garment. If you ship a small carton inside a mailer, measure the carton’s length, width, and thickness.

2) Allow space for thickness and the closure area

Mailers are typically specified by flat dimensions. If your item has thickness, you need extra width and length so the bag can wrap around the contents without excessive tension. Also allow room for the sealing flap/lip so the closure is not forced onto the product.

3) Choose opacity when privacy matters

Opaque white mailers help conceal contents. This is useful for consumer deliveries, higher-value items, or any shipment where you prefer the contents not to be visible during handling. If you ship branded retail packaging, opacity can also help keep the presentation consistent on arrival.

4) Consider handling conditions (sorting, conveyors, weather)

Poly mailers are commonly selected for their resistance to light moisture and their ability to withstand typical courier handling. If your parcels may be exposed to rain during last-mile delivery, ensure labels are applied to a clean, dry surface and consider using label pouches or over-labeling for extra protection.

5) Plan for returns and resealing

If your operation handles returns, consider how customers will re-pack items. A mailer that is easy to open without damaging the contents can simplify returns. Including a return label inside the parcel and leaving enough space for re-packing can reduce customer frustration and product damage.

Packing tips for better transit performance

• Remove excess air: Flatten the parcel before sealing to reduce ballooning, which can increase snag risk on conveyors.
• Keep seams unstressed: Avoid overfilling; if the bag is tight, move up a size to reduce seam strain.
• Protect sharp corners: If shipping small cartons or items with edges, consider an inner wrap so corners do not rub through the film.
• Apply labels correctly: Place labels on the flattest area, press firmly, and avoid placing labels across folds or seams.
• Use consistent folding: Standardising garment folds helps you choose the right size and improves packing speed.

Common applications

• Apparel and textiles (t-shirts, polos, leggings, scarves)
• Soft accessories (caps, fabric bags, non-fragile items)
• Printed materials when placed in an inner sleeve (catalogues, brochures)
• Multi-item orders where a lightweight outer pack is preferred

Storage and handling guidance

Store poly mailers in a clean, dry area away from direct sunlight and heat sources. Keeping cartons sealed until use helps prevent dust contamination that can affect label adhesion. In busy packing areas, it can help to stage the most-used sizes at bench height and keep larger sizes nearby for multi-item orders.

Questions & Answers