2 brightly colored square mailer box samples.

Square Mailer Box Samples

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

Reviews

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Reviewed by 2 customers

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

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.