Best Single Wall Box Mailers of 2025

* We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation.
Single Wall Box Mailers are a type of packaging material used for shipping and mailing various items. These mailers are made of corrugated cardboard and have a single layer of fluting, providing moderate strength and protection to the contents inside. They come in a variety of sizes and are easy to assemble and seal with tape. Single Wall Box Mailers are a cost-effective solution for sending lightweight and non-fragile items such as documents, books, clothing, and small electronics. They are a reliable and practical option for both personal and business use.
At a Glance: Our Top Picks
Top 10 Single Wall Box Mailers
ZYBUX Brown Cardboard Shipping Boxes Pack of 20
The ZYBUX Cardboard Boxes are eco-friendly and made from 100% recyclable materials, making them a sustainable choice for your packing needs. Their durable design ensures that your belongings remain secure during transit, whether you are moving house or shipping items. The multi-purpose utility allows you to use these boxes for storage or to send gifts, providing flexibility for various situations. Additionally, their protective design safeguards your valuables from damage during travel, ensuring peace of mind.
SmithPackaging 25 Single Wall Cardboard Boxes
The SmithPackaging Cardboard Boxes are perfect for your mailing needs. This pack contains 25 flat packed single wall boxes, each measuring 254x203x152mm (10x8x6 inches). They are designed to protect your items from impact during transit, ensuring your fragile products arrive safely. Made from robust recycled paper, these boxes are not only durable but also 100% recyclable, making them an environmentally friendly choice. With their cost-effective solution for storage or mailing, you can confidently send your items without worry.
5 Medium Cardboard Shipping Boxes 457x305x254mm
The W E Roberts Cardboard Boxes provide a cost-effective solution for your shipping and storage needs. Their flat-packed design ensures easy handling and storage when not in use. With dimensions of 457 x 305 x 254 mm (18 x 12 x 10 inches), these boxes are perfect for a variety of items, helping you to organise and protect your belongings. The single wall construction offers adequate strength for sending parcels safely, giving you peace of mind during transit.
ZYBUX 12x9x9" Eco-Friendly Cardboard Boxes
The ZYBUX Cardboard Boxes are an eco-friendly and recyclable solution for all your storage and shipping needs. Made from durable cardboard, these boxes ensure your items are well protected during transit or storage. You can easily carry them thanks to the optional handles, making relocation a breeze. Additionally, their versatile design allows you to use them for various purposes, from moving house to mailing gifts or even for arts and crafts projects.
RelianceUK Pack of 25 Small Cardboard Boxes
The RelianceUK Small Cardboard Boxes are crafted from durable Kraft corrugated cardboard, ensuring your items are well-protected during shipping. They arrive flat-packed, which saves you valuable storage space and makes it easy for you to assemble them when needed. These boxes are perfect for storing and shipping small items, making them ideal for small businesses and home use. Additionally, they are recyclable and eco-friendly, allowing you to pack and ship items like mugs, jewellery, and small toys with peace of mind.
Triplast 5x5x5" Shipping Gift Cube Boxes
The Triplast Gift Cube Boxes are ideal for mailing and shipping small items. Made from corrugated single wall cardboard, these boxes provide durability and protection for your contents. Each pack contains 25 flat-packed boxes, making storage convenient until you need them. With dimensions of 5x5x5 inches, they are perfect for gifts or other small products, ensuring they reach their destination safely and securely. You will appreciate the ease of use and versatility these boxes offer for various shipping needs.
Triplast Small Single Wall Cardboard Boxes
The Triplast Cardboard Boxes are made from corrugated single wall cardboard, offering sturdy protection for your items during shipping. With a size of 9x6x6 inches (229x152x152mm), these boxes are ideal for mailing postal gifts or various small items. Supplied flat-packed, they are easy to store until needed, saving you space. This pack of 25 ensures you have plenty of boxes on hand for all your mailing needs, making your shipping process convenient and efficient.
Pack of 50 Single Wall Cardboard Boxes
The STORM TRADING GROUP Boxes are ideal for your mailing and shipping needs. These lightweight single wall postal boxes help you keep postage costs low, making them perfect for budget-conscious users. They are a staple for mail rooms and eCommerce operations, ensuring you have a reliable packaging solution. The boxes come flat packed for convenient storage, and you can easily assemble them by taping the flaps. With dimensions of 12x9x6 inches, they are specifically designed for medium parcels, although it's wise to check with your carrier regarding size acceptance.
STORM TRADING GROUP Small Cardboard Boxes
The STORM TRADING GROUP Boxes are designed for convenience and ease of use. They arrive flat packed, allowing you to assemble them quickly when needed. Ideal for holding a variety of small to medium items, such as gifts or stationery, these boxes offer great versatility. Made from good quality single wall cardboard, they provide durable protection against damage, dust, and dirt, ensuring your belongings remain safe. Plus, you can reuse and recycle them, making them an eco-friendly choice for all your packaging and storage needs.
Triplast 8x6x4" Small Cardboard Boxes
The Triplast Cardboard Boxes are ideal for shipping and mailing. Made from corrugated single wall cardboard, these sturdy boxes offer excellent protection for your items during transit. With a size of 8x6x4 inches (203x152x102mm), they are perfect for a variety of products, ensuring that your gifts or parcels arrive in great condition. The pack contains 100 flat packed boxes, making it convenient for you to store until needed. This means you can easily manage your shipping supplies without taking up too much space.
Frequently Asked Questions (FAQs)
1. How strong are single wall boxes?
For lighter and less fragile products, single wall boxes can still provide the right protection and can hold up to 10kg in weight.
2. What is a single walled box?
A single wall box is constructed using three layers of paper that are glued using starch into one single, sturdy sheet. The interior layer, called flutes or waves (the squiggly bit), play the biggest role in determining the box's strength.
3. What is single wall carton?
Single wall corrugated cardboard consists of an inner and outer liner with a fluted corrugated sheet in between. Single wall board is used in the lower weight range of shipping cartons. They are of low weight and are only suitable for low packing weight.
4. What is the smallest box that can be shipped?
According to the USPS Postal Explorer, the minimum package size is at least 6 inches in length, 3 inches in height, and 1/4 of an inch in thickness. Written out in decimal points, that size is: 6 x 3 x 0.25″.
During our single wall box mailer research, we found 184 single wall box mailer products and shortlisted 10 quality products. We collected and analyzed 8,398 customer reviews through our big data system to write the single wall box mailers list. We found that most customers choose single wall box mailers with an average price of £17.11.
The single wall box mailers are available for purchase. We have researched hundreds of brands and picked the top brands of single wall box mailers, including ZYBUX, SmithPackaging, W E Roberts, RelianceUK, Triplast. The seller of top 1 product has received honest feedback from 1,625 consumers with an average rating of 4.8.

Jordan Akthar owns one stationery store in Bradford, and another in Derby. He started with a corner bookshop, and now the rest is history. He is often found in his stores taking count of inventories of books and stationery. Jordan also likes to write, and this drove his passion for writing articles on stationery maintenance. He owns a blog, where in his free time, he would write DIY tips on how you can recycle and refine your stationeries.