Best Self Seal Box Mailers in 2026

Quality Park 6" x 8" photo document mailers are made of extra rigid fiberboard to protect large photos. Perfect for shipping and storage. Our photo envelopes have Redi-Strip self sealing closures for a fast, instant seal. Redi-Strip envelopes are the perfect mailroom update for concerns about surface germs in the workplace. Skip the yuck, stay safe and save time with every mailing. Plus, the peelable paper strips protect your adhesive from dust so envelopes last longer in storage. Bright white envelopes made from 24 pt recycled fiberboard make a clean and professional presentation. Ideal for sending family photos, wedding pictures and important documents. 25 per box.

Please don’t lick these envelopes; Quality Park Redi-Strip closures don’t require moisture—just peel and press for a safe, dry, sanitary seal

Peel-off strips protect adhesives from dust so your envelopes will last longer; stock up for bulk mail and special events

Dimension: These shipping boxes' outer size is 9x6x4 inches, and inner size is 8 5/8 x 5 7/8 x 3 7/8 inches.

Sturdy Material: Made of 3-layer recyclable corrugated cardboard which is lightweight but sturdy, making it perfect as shipping boxes for small business.

Quick Assemble: The black packaging boxes can be assembled quickly in seconds without glue, tape, or staples.

Dimension: These shipping boxes' outer size is 12x9x4 inches, and inner size is 11 5/8 x 8 7/8 x 3 7/8 inches.

Sturdy Material: Made of 3-layer recyclable corrugated cardboard which is lightweight but sturdy, making it perfect as shipping boxes for small business.

Quick Assemble: The black packaging boxes can be assembled quickly in seconds without glue, tape, or staples.

Dimension: These shipping boxes' outer size is 8x8x24 inches, and inner size is 7 5/8 x 7 7/8 x 3 7/8 inches.

Sturdy Material: Made of 3-layer recyclable corrugated cardboard which is lightweight but sturdy, making it perfect as shipping boxes for small business.

Quick Assemble: The black packaging boxes can be assembled quickly in seconds without glue, tape, or staples.

The Black shipping box is made of three-layer pressure-resistant corrugated cardboard, which is lightweight but sturdy, and are ideal boxes for packaging fragile items.

Corrugated cardboard boxes are manufactured from one-piece tool die-cutting, which allows for neat, smooth, and burr-free edges.

Shipping boxes for small business have a sense of fashion and style. The classy mailer box is perfect for small businesses to ship their e-commerce orders. It also makes a great gift box for occasions like Christmas, Birthdays, Valentines, Wedding Anniversaries, etc.

The Black shipping box is made of three-layer pressure-resistant corrugated cardboard, which is lightweight but sturdy, and are ideal boxes for packaging fragile items.

Corrugated cardboard boxes are manufactured from one-piece tool die-cutting, which allows for neat, smooth, and burr-free edges.

Shipping boxes for small business have a sense of fashion and style. The classy mailer box is perfect for small businesses to ship their e-commerce orders. It also makes a great gift box for occasions like Christmas, Birthdays, Valentines, Wedding Anniversaries, etc.

The Black shipping box is made of three-layer pressure-resistant corrugated cardboard, which is lightweight but sturdy, and are ideal boxes for packaging fragile items.

Corrugated cardboard boxes are manufactured from one-piece tool die-cutting, which allows for neat, smooth, and burr-free edges.

Shipping boxes for small business have a sense of fashion and style. The classy mailer box is perfect for small businesses to ship their e-commerce orders. It also makes a great gift box for occasions like Christmas, Birthdays, Valentines, Wedding Anniversaries, etc.

White Shipping Boxes: Made of recycled cardboard paper, eco friendly. Outer size: 7x5x4 inches; Inner size: 6 5/8 x 4 7/8 x 3 7/8 inches, 25 pack, white color.

Heavy Duty Cardboard Boxes: Rugged 3 layers thick kraft construction, This reinforced corrugated boxes superior protection for your valuable items. Lightweight but sturdy for shipping. Can be easily used for UPS, USPS, Fedex shipping.

Easy to Assemble White Mailer Box: come flat, can be assembled quickly without any tools like tape or glue. Tab locking makes this small packing boxes closed security. Protect your product so that it can arrive safely.

The Pink shipping box is made of three-layer pressure-resistant corrugated cardboard, which is lightweight but sturdy, and are ideal boxes for packaging fragile items.

Corrugated cardboard boxes are manufactured from one-piece tool die-cutting, which allows for neat, smooth, and burr-free edges.

Shipping boxes for small business have a sense of fashion and style. The classy mailer box is perfect for small businesses to ship their e-commerce orders. It also makes a great gift box for occasions like Christmas, Birthdays, Valentines, Wedding Anniversaries, etc.

Black Shipping Boxes: Made of recycled cardboard paper, eco friendly. Outer size: 12x9x4" inches; Inner size: 11 5/8 x 8 7/8 x 3 7/8 inches, 20 pack, matte black color.

Heavy Duty Shipping Boxes: Rugged 3 layers thick kraft construction, This reinforced corrugated boxes superior protection for your valuable items. Lightweight but sturdy for shipping. Can be easily used for UPS, USPS, Fedex shipping.

Easy to Assemble Black Mailer Box: come flat, can be assembled quickly without any tools like tape or glue. Tab locking makes this small packing boxes closed security. Protect your product so that it can arrive safely.

Black Shipping Boxes: Made of recycled cardboard paper, eco friendly. Outer size: 13x10x3 inches; Inner size: 12 5/8 x 9 7/8 x 2 7/8 inches, 20 pack, matte black color.

Heavy Duty Cardboard Boxes: Rugged 3 layers thick kraft construction, This reinforced corrugated boxes superior protection for your valuable items. Lightweight but sturdy for shipping. Can be easily used for UPS, USPS, Fedex shipping.

Easy to Assemble Black Mailer Box: come flat, can be assembled quickly without any tools like tape or glue. Tab locking makes this small packing boxes closed security. Protect your product so that it can arrive safely.

【Wise Choice】OUGEBOX pink mailer shipping boxes ​size 6x4x1.6 inch (L x W x H). Small shipping boxes made of four layers of recyclable lightweight E-Flute corrugated cardboard are perfect for packing small business supplies and small gifts.

【Exclusive Cardboard Boxes】Using new corrugated cartons can help differentiate your products from your competitors. Are those humble boxes really worthy of your product and brand?— Choose our professional business packaging boxes.

【Superior Safety】The unforgettable pink mailer boxes can prevent fingers from scratching during assembly. No tape and glue are needed during installation, saving costs. Ultra-light-weight will save most freight.

【SAMPLES】If you are not sure about the size and quality of mailer boxes for shipping , you can try to choose 2 samples double sided black shipping boxes. Please note samples only Include 2 pieces small shipping boxes

【STURDY AND HARDER】Corrugated boxes are made of recyclable cardboard. Small shipping boxes pretty sturdy to protect product inside from being damage during violent transportation. If you are still doubts about the quality, you can take a sample packaging boxes for testing.

【EASY TO ASSEMBLE 】 Small packaging boxes can be assembles in seconds without any tapes or glue. Upgrade high quality recyclable cardboard flat shipping box can avoid wasting time on packaging without tools.

Dimension: Each chipboard sheet is 30cm x 30cm/11.8" x11.8" (about 12") and 1/8" thick, B-Flute. Can be cut to your desired size and shape.

These corrugated cardboard sheets are perfect to add extra protection when shipping. Use these cardboard mailer inserts for extra protection against bending when putting important documents in the mail, reinforce envelopes to keep sensitive documents flat on their journey through the post.

Perfect for DIY crafting projects in different situations, such as upcoming wedding, birthday party, baby shower, or family gathering.

Reliable Material: our shipping boxes are made of quality corrugated cardboard material, reliable and reusable, safe and sturdy, not easy to break or fade, which can serve you for a long time

Suitable Size: our small boxes measure approx. 15 x 10 x 4 cm/ 6 x 4 x 1.6 inches, suitable size for you to mail some light and small items, such as jewelry, cosmetics, soaps, toys, cookies and so on

Wide Usage: these corrugated packaging boxes are practical and useful tools, which can be widely applied as express boxes for transportation, you can also use to store small items in wedding, anniversaries, birthday party, baby shower

Sold as 100/Box.

Classic styling and square flap.

Wove finish resists print smearing.

THICKENED PAPER MATERIAL - It is made of high-quality corrugated cardboard and has a multi-layer structure that provides excellent compression resistance. The 1/8 inch corrugated cardboard sheets are not easy to break or deform, and are strong and durable.

IDEAL SIZE - Each piece of corrugated cardboard is cut by a professional cutting machine, with a uniform size of 7.8 x 9.8 inches, and a thickness of 1/8 inch, which is not too large or too small. A total of 50 sheet corrugated cardboard pads are included, which can meet your many needs.

ENSURE SAFETY - Designed to be used as an insert pad to provide extra protection for the article to form a firm and prevent bending. When you need to transport important documents, fragile items, handicrafts, etc., put the 1/8” inch cardboard sheets in the middle layer of the item to play a role.

[Suitable Size] The packaging boxes set includes 26 packages of cardboard boxes. The size of this shipping box is 8"x 6"x 3" (L x W x H), suitable for DIY and packaging or mailing those small and light items.

[Material] Our shipping boxes are made of recyclable corrugated cardboard, which are lightweight but sturdy, which can keep your product store safe.

[Easy to fold] These small shipping boxes can be assembled in a few seconds and do not require tape, glue or staples.