Best Birthday Mailers in 2026

🍀【Durable Materials】: Crafted with virgin polyethylene plastic. Our poly mailers are made to be incredibly durable to resist punctures, tears, and moisture. They are waterproof and tearproof. The explosion-proof edge and strong viscosity will help protect your items from losing.

🍀【Unique Design】: Our pretty poly mailer bags are a great choice if you are tired of plain normal mailers. The watercolor painting flower is uniquely designed. It’s not only good for packaging for your business but also for wonderful gift packaging.

🍀【Wide Application】: The 10x13inch mailer bags are quite useful packaging bag for T-shirts, blankets, scarves, or other non-breakable items of daily use, professional packing to protect your item, excellent mailers provide convenient and high-quality, low-cost transportation services. The unique design packing creates a new look for your goods.

MEDIUM BOXES: The finished dimension is 10 5/8"L x 7 7/8"W x 1 7/8"H, and each cardboard box weighs 4.1 oz, which is ideal for packaging small business or as party favor boxes

GLOSSY BLUE: Blue evokes reliability and infinity, these gift boxes for presents in brilliant color help to establish the brand’s visual identity and leave a memorable first impression

STURDY MAILERS: Made of recyclable corrugated cardboard paper, lightweight yet sturdy, securely closed from all sides which provides substantial protection to your products and gifts

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.

【Useful Space And High Quality Envelopes】4.375x5.75 inches, The envelopes are made with natural kraft paper, designed to give each envelope a sleeker and more elegant feel.

【Sturdy and Fashionable Design】Road kraft envelopes are sturdy to protect your things perfectly. Those kraft envelopes with fashionable design are perfect for wedding greeting cards, business cards, thank you notes, invitations, gift cards, tags etc.

【Self-Adhering Envelopes】 Road small kraft envelopes come with a Water-based Adhesive,you can glue the envelope just with some water. It cannot be opened without visible signs of tampering. CAUTION: sticky closure should be adhered in 1 minute.

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

What's Included: You will receive 50 9x12 corrugated cardboard sheets.

Dimensions: Each piece of corrugated cardboard measures 9x12 inches and is 1/16 inch thick.

Easy To Customize: The cardboard can easily be customized with paint, glitter, stickers, and ribbon to create custom decor for an upcoming baby shower, birthday party, or holiday gathering.

Valuable and Practical Set: there are 50 brown shipping boxes, sufficient to cover your various demands of using, replacing, sharing, they are ideal for packing gift, mailing parcels and storing your stuffs; They will also be packed flat to avoid deformation and breakage during transit

Strong and Dependable: made of quality corrugated cardboard, the boxes for small business are strong and dependable, hard to break or deform, reusable and functional, with a certain recoil to better preserve your mailing items

Ideal Size and Weight: measuring about 5 x 5 x 5 inches/ 12.7 x 12.7 x 12.7 cm, these shipping boxes for small business have the ideal size and weight for reducing shipping costs; They are ideal for mailing or packing compact and lightweight items, like small trinkets, mugs, small soaps, aromatherapy, snacks, and more

Sufficient Quantity for Using: you will receive 110 pieces of corrugated cardboard sheets in brown, designed with a size of approx. 28 x 21.5 x 0.15 cm/ 11 x 8.5 x 0.06 inches, enough to meet your packaging and crafting demands in daily life

Reliable Material for Confident Using: the corrugated insert is made of quality corrugated paper, has a smooth surface and reasonable thickness, able to serve as an ideal cushion for your items, to reduce scratches

Flexible to Use: it's easy for you to stack several flat cardboard sheets together, to make a thicker cushion, keeping your articles from abrasion during transportation; You can easily cut the sheets according to your actual needs, not occupying too much time or energy

📦【Shipping Box】Outside Dimensions: 9 x 6 x 4",20 Pack,Corrugated box made of recyclable cardboard. easy to simple and quick to assemble without glue, staples or tape.For details on the installation process, see the video.

📦【High Hardness】3 layers thick kraft construction, high-quality ECT-32 corrugated cardboard with slots makes the rectangular mailing boxes reliable and sturdy, and the standard 90°angles will protect items inside while delivery.

📦【Mulit-Purpose】These small shipping boxes meets most mailing specifications, which are great size for Toys,books, makeup, clothes, jewelry, Birthday,Anniversary, crafts and so on,can meet most shipping carrier specifications.

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.