Square Mailer Box Samples

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Trying to figure out which mailer box suits your needs and your products? Order a sample box for only $4 – and get free standard shipping.
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Size (L x W x H)

12" x 12" x 2.25"

14" x 14" x 2.25"

Quantity

Browse our square mailer sizes to find the right fit.

2 sizes available
1/8" B-flute corrugated cardboard
Pre-printed with a sample design
Free standard shipping

Packaging Samples: Visit our samples page to see all available options.

Try before you buy

Need square mailer boxes, but not sure what size will work for you? Order a sample in your choice of sizes for only $4 and get free standard shipping – no code needed. Once you receive your box pre-printed with a sample design, you'll know whether it's the right size for you. See how easy it is to assemble them. Get a feel for the box's quality and sturdiness. You will then be able to order your mailer boxes in bulk with complete confidence.

Full surface printing

Our square mailers aren’t your typical plain cardboard box. You’re able to print on the full surface, which means that your brand – and your logo – will be seen from all angles. It’s a great way for your custom package to get noticed in the mail.

Durable cardboard

Printed in full color, our square mailer boxes are made of B-flute cardboard. Sturdy and easy to assemble, they are a great packaging choice for mailing apparel, books, stationery, beauty products and more.

FAQs

Reviewed by 4 customers

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Perfect size, great quality

Jan 26, 2026 | Jodie H. |

Verified Buyer

Grabbing this sample box helped me determine exactly what I need for my business. I was able to test out how I wanted to present my products to my clients without have to pay full price. Highly recommend buying the sample if you are trying to figure out what your needs are.

Very nice printing

Jan 12, 2026 | Cassidy S. |

Verified Buyer

The large box assembled easily, but the smaller one I received had trouble locking the right side in place. Other than that they are well-printed and feel premium!

Response from Vistaprint Customer Care Team:

Thank you for your 4-star review! We’re glad to hear that the boxes were well-printed, felt premium, and that the large box assembled easily. We do apologize for the issue you experienced with the smaller box not locking properly on one side. Your feedback is valuable and will be shared with our production team to help improve consistency and assembly.

Great purchase

Nov 18, 2025 | Janay W. |

Verified Buyer

For a while I had been talking about getting custom boxes for my books, and after ordering the box samples I am completely sold on getting them from Vista print. Although the samples don’t come with your custom design; the samples are so beneficial. You get to see the actual size of each box and learn how to fold and put them together. Thank you Vista print, I can’t wait to actually order my custom ones. Super excited.

FLAT SHIPPING BOX SAMPLES

Oct 4, 2025 | Gail P. |

Verified Buyer

We sure appreciate being able to order sample boxes. They were instrumental in helping us determine what size boxes we need for our resources. We decided on the sizes, designed them, ordered them, received them and are 100% thrilled with the way our custom design looks on VistaPrint's high quality full print mailer boxes. Thank you VP for having such great products and excellent customer care. With blessings - GC

Displaying Reviews 1-4

No more guesswork. We take care of the entire design process, from brainstorming ideas to delivering the files to your account.

Frequently asked questions

No, your box will arrive packed flat.

See our “Overview” section for a video that walks through assembling your box for the first time.

Depending on the size you choose the weight will vary. See the dimensions below: 12" x 12" x 2.25": 8 oz. 14" x 14" x 2.25": 10 oz. 16" x 16" x 2.25": 13 oz.

B-flute corrugated cardboard is a sturdy material that is 1/8" (3mm) thick. It is crush- and puncture-resistant, making it well suited to carrying heavier goods. Our B-flute cardboard is made with a white exterior and kraft paper interior.