Best Postal Box Mailers of 2025

The SmithPackaging C5 Boxes come in a convenient pack of 50, making them ideal for bulk mailing. With internal dimensions of 229 x 162 x 20 mm, they are perfectly suited for sending larger letters and documents. Constructed from durable single wall corrugated cardboard, these boxes provide excellent protection for your items during transit. Plus, being 100% recyclable means you can feel good about your environmental impact when using these boxes.

The All-Pack Solutions Parcel Boxes come in a convenient pack of ten, providing ample space for your mailing needs with their generous dimensions of 350mm x 250mm x 160mm. Designed with a single wall construction, these deep boxes are sturdy enough to protect your items during transit. Their brown colour adds a professional touch to your parcels. Manufactured in the UK, these boxes ensure high quality and reliability, giving you peace of mind when sending your goods.

The AKAR Postal Boxes are ideal for sending fragile items securely, thanks to their robust single-wall corrugated cardboard construction. These large letter postal boxes are lightweight yet sturdy, ensuring your items are well-protected during transit. With a convenient locking tab, you can easily secure your package, making them perfect for gifts or retail items. Plus, they are stackable and quick to assemble, saving you time and effort when preparing your shipments.

The MEG4TEC Large Letter Boxes are designed to meet your mailing needs with convenience and reliability. Each box has an external size of 235mm x 165mm x 22mm, making it perfect for large letter shipping. With an internal size of 225mm x 160mm x 20mm, you can easily fit various items securely inside. Weighing only 35g, these boxes are lightweight, which can help reduce postage costs. Made from sturdy 1mm thick single wall cardboard, they provide excellent protection for your contents during transit.

The Triplast M-Envelope offers a versatile packaging solution with its unique design that transforms from a flat envelope into a postal box. You can easily adjust the depth from 1mm to 70mm, accommodating a range of items without compromising on safety. Its hassle-free peel & seal strip allows for quick packing, saving you time and eliminating the need for extra tape. Made from durable, lightweight cardboard, this product ensures your items are well-protected while keeping shipping costs low, making it ideal for your eCommerce needs.

The SR Mailing C4 Postal Boxes are designed for your shipping needs. Made from robust 1.2mm thick single wall cardboard, they ensure your items are well-protected during transit. Each box is delivered flat-packed and securely wrapped, making storage easy and convenient. You will appreciate how quick and easy they are to assemble, allowing you to prepare your parcels in no time. With a size qualifying for large letter postage, these boxes are perfect for sending documents and other flat items efficiently.

AKAR Die Cut Boxes are versatile and durable cardboard solutions for your shipping and storage needs. Made from high-quality corrugated cardboard, these boxes ensure excellent protection for your items during transit. You will appreciate the easy assembly feature, which allows for quick folding and secure taping, saving you time. Their flat storage capability means you can keep them out of the way when not in use, making them perfect for small businesses, moving, or mailing. With these boxes, you can ship various items such as books, gifts, and clothes effortlessly.

The AKAR Postal Boxes are ideal for shipping fragile items securely. Made from durable single-wall corrugated cardboard, they ensure your belongings remain safe during transit. Their lightweight design makes them easy to handle, while the locking tab allows for secure closure. These versatile boxes are perfect for gifts, stationery, or e-commerce shipping, providing a practical solution for all your mailing needs.

The W.E. Roberts Mailing Boxes come in a convenient pack of 50, making them ideal for all your mailing needs. Each box is crafted from strong single wall board with a crisp white outer, ensuring your items are well-protected during transit. You will appreciate the flat-packed design, which allows for easy storage until you need them. When it's time to send your packages, the hinged lid with tuck-in flaps creates a secure yet lightweight box, helping you to keep your postage costs down.

The Triplast Postal Boxes are designed for efficiency and convenience. With a quick assembly feature, you can reduce your packing time by up to 70%, allowing you to focus on other tasks. Their sturdy construction ensures that your parcels remain secure during transit, minimising the risk of damage. The effortless unboxing experience, with lightweight design and 'rippa' strips, means your recipients can open their packages easily without any tools. Additionally, these boxes are eco-conscious, being made from 100% recyclable and biodegradable materials, making them a responsible choice for shipping.