Best Large Letter Box Mailers of 2026

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 PIP Box Mailers come in a convenient pack of 50, perfect for your shipping needs. With external dimensions of 235mm x 165mm x 22mm, they qualify as large letter boxes, making them ideal for mailing various items. The sturdy 1mm thick single wall cardboard ensures your packages are well-protected during transit. Additionally, these mailers are quick and easy to assemble, allowing you to save time on packing. You can seal them securely with clear or brown tape made from recycled material, contributing to an eco-friendly packaging solution.

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.

The Triplast C6 Postal Box is designed with an easy-to-assemble FEFCO 0427 style, featuring fold-over ends and secure ear lock lids, which helps you pack quickly and safely. It fits Royal Mail's 'Large Letter' size, allowing you to save on postage costs when sending smaller items. With internal dimensions of 160x110x20mm, the box offers ample space for phones, accessories, or other small goods, while its robust 125 WK/T single wall cardboard construction ensures reliable protection during transit.

The MEG4TEC Mail Postal Boxes are designed for efficient shipping with their external dimensions of 235mm x 165mm x 22mm, making them suitable for large letter qualifications. The internal size of 225mm x 160mm x 20mm provides ample space for your items while keeping them protected. Each box weighs just 35g, ensuring that your postage costs remain low. Made from sturdy 1mm thick single wall cardboard, these boxes offer excellent durability, giving you peace of mind that your items will arrive safely at their destination.

The AKAR C5 Postal Boxes are large letter cardboard boxes designed to help you ship items securely. Made from durable, single-wall corrugated cardboard, they are lightweight yet sturdy, keeping your items safe during transit. These boxes are ideal for sending fragile goods or gifts and can be easily decorated with ribbons for a personal touch. The secure locking tab ensures your package stays closed without extra tape or glue, making them quick and simple to assemble and use for mailing, postage, or delivery at home or work.