Mailing Boxes

Boxes built for the post.

Most cardboard boxes aren’t designed with the courier network in mind. Mailing boxes are flat-packed for easy storage, quick to assemble, and strong enough to protect your products without needing extra outer packaging. Seal them with tape and hand them straight to your courier.

Whether you’re sending one item or fulfilling hundreds of orders a week, having the right mailing box makes the whole process faster, cheaper, and more professional.


What makes a good mailing box?

Not all cardboard boxes handle the postal network well. A purpose-built mailing box is designed to be stacked in vans, sorted through depots, and take the knocks of transit. The key things to look for:

  • Corrugated construction: fluted board that absorbs impact better than flat cardboard
  • Self-locking or tuck-top design: secure without needing excessive tape
  • Standard sizing: compatible with Australia Post and major courier services
  • Flat-pack storage: takes up minimal warehouse or home storage space

What sizes do we stock?

Our mailing boxes cover the range from small parcel sizes right through to larger boxes for bulkier items. Die-cut mailers, standard RSC shipping cartons and super-flat postal boxes are all available in various sizes to suit different products and shipping requirements.

Not sure what size you need? Use our box size calculator to work it out before you order.


Who are mailing boxes for?

  • Online stores and e-commerce businesses
  • eBay, Facebook Marketplace, and private sellers
  • Small businesses with regular dispatch needs
  • Anyone sending fragile or valuable items through the post
  • Gift sending and subscription box services

Need boxes for moving house instead? Our moving boxes are a better fit for that job.


Shop mailing boxes at Echo Boxes Online.

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