Best Flat Box Mailers of 2025

The BOX USA Shipping Boxes are ideal for all your moving and storage needs. These sturdy boxes can hold up to 65 pounds, making them perfect for packing clothing, books, and various household items. Their lightweight design helps you manage your belongings easily, whether you're shipping or storing. Additionally, the boxes are made from single-layer corrugated cardboard, ensuring they are both durable and easy to handle. With a bulk pack of 50, you’ll have plenty of boxes on hand for your small business or personal use, making packing more efficient and organized.

The CH-BOX Shipping Mailers offer a versatile solution for your mailing needs. Their height-adjustable design allows you to customize the box depth from 0.5 to 2 inches, making it easy to fit a variety of flat items like comic books or artwork. You can quickly pack your items by placing them in the center, folding the sides, and sealing with tape. The crush-proof construction ensures your contents remain safe during shipping or storage, while the durable corrugated material provides extra strength. With these boxes, you can confidently send your products without worrying about damage.

The Pemtow 13x10x2 Shipping Boxes Set of 20 is perfect for your packaging and mailing needs. Made of high-quality corrugated cardboard, these boxes are durable and safe, with tuck tabs that keep your items secure. They are also easy to fold and tool-free, making them convenient to use. These 13x10x2 small shipping boxes have neat, smooth edges, and are perfect for your own label or DIY. They are multipurpose and widely used in packaging, mailing, and business, making them a great choice for toys, candles, small soaps, biscuits, or other small items.

The PHAREGE Shipping Boxes are designed for your mailing and packaging needs. Made from lightweight yet durable kraft corrugated cardboard, these boxes ensure your small items are well-protected during transit. If you run a small business, these boxes are perfect for packaging and gift wrapping, allowing you to personalize them with labels or ribbons. Assembly is a breeze with their easy-fold design, and the secure tuck top features two locking tabs to keep everything safe inside. With dimensions of 13x10x2 inches, they are perfectly sized for various items and can be stacked neatly for storage.

The Golden State Art Mailers are designed to make your shipping process easier and more efficient. With their sturdy construction, these mailers protect your items during transit, ensuring they arrive in excellent condition. The easy-fold design means you can set them up quickly, saving you time when packing. Their adjustable sizing allows you to accommodate various products, ensuring a snug fit every time. Plus, the multi-depth feature provides added flexibility, reducing the need for extra packing materials. This combination of convenience and efficiency makes these mailers an ideal choice for your shipping needs.

The HORLIMER shipping boxes set comes with 25 boxes made of sturdy, recyclable, and durable single wall corrugated cardboard that is easy to assemble without any tapes or glue. The set is stored flat inside a larger carton and can be used for shipping, mailing, or storing small items. The white cardboard boxes are suitable for your own label or DIY, and the 32 ECT grade fits for standard stacking. The outer size of the box is about 13x10x2 inches (L x W x H), and the inner size is 12.6x9.9x1.9 inches.

This 10 pack of brown kraft corrugated cardboard mailer boxes are perfect for shipping small, lightweight and fragile items. With a dimension of 9.25"x 9.4"x 1.5", the boxes are super strong yet lightweight to save on postage and packaging. Assembling in seconds without tape, glue or staples, these boxes are easy to fold and can be unfolded when not in use. They are great for shipping and storing flat items such as books, T-shirts and photo frames. The quality, crush-proof corrugated cardboard meets Edge Crush Test and Bursting Test Standards to ensure safe shipping of your items.

AVIDITI Shipping Boxes, also known as AVIDITI Boxes, are perfect moving supplies for packing, shipping, and storage. These heavy-duty boxes are designed to hold up to 65 lbs and have been tested and certified to meet all single wall box storage, mailing, and freight requirements. With a 50-pack bulk box value bundle, these boxes are manufactured by Aviditi and are made of unprinted cardboard. They come in extra large, large, medium, and small sizes, making them perfect for storing clothing, books, household items, and office supplies. These boxes are also 100% recyclable and reusable, making them an eco-friendly choice. Made in the USA, AVIDITI Shipping Boxes offer simple materials and excellent performance.

MEBRUDY Shipping Boxes offer a convenient solution for your mailing needs. These boxes are designed for easy assembly, allowing you to fold them without needing any tape or glue, saving you time during packaging. Their crush-resistant construction ensures that your items are well-protected during transit, thanks to the sturdy ECT-32 corrugated cardboard. These versatile boxes are perfect for shipping small and fragile items, making them ideal for businesses. Plus, the plain Kraft paper surface allows you to personalize each box with your branding, giving your products a professional appearance when they reach your customers.

The Livejun Black Shipping Boxes come in a convenient 24-pack, perfect for your mailing and packaging needs. Their elegant black exterior and brown interior not only look professional but also make them ideal for gift-giving. You’ll appreciate the easy assembly, as these boxes can be put together in seconds without any tape or glue. Made from durable, eco-friendly materials, they protect your items during transit, ensuring they arrive safely. Use these versatile boxes for a variety of items, from books to jewelry, and elevate your packaging game.