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Explore Our Box Options

Custom Square Mailer Box

Our square mailer made of corrugated cardboard serves as an elegant presentation box for apparel, wall art, stationary kits, and more. Our boxes simply need a shipping label to go right into the mail.

Customize and Check Prices

Design Online

Design with Canva or PDF File

Need an Example?

Industry-Leading Turn Times

No Minimums

High-Quality Full-Color Printing

Intuitive 3D Design Tool

Super Responsive Customer Service

100% Recyclable

Product Details

Custom Square Mailer Boxes

Sometimes it's hip to be square... Square mailer boxes are perfect for an array of flat products, ranging from shirts and books, to plates and wall decor. Take advantage of the large display flap to feature your logo front and center on your shipping box for instant recall among your customers. We offer three sizes, up to a 16" x 16" x 2.25" to provide maximum protection for your shipments.

Our Inks

Our digital CMYK printing with UV cure ensures that the ink pops and has a slight sheen, and with no minimum quantity and quick production turnaround, you can order boxes on demand. Use our free design tool featuring hundreds of customizable templates to create a box that will truly wow your customers the minute it arrives at their door!

Our Materials

Our shipping containers are made from sturdy corrugated cardboard in fluting sturdy enough to withstand the rigors of most shipping scenarios. (We've all seen those packages that were abused beyond recognition...)

Fluting: B-flute
Exterior material: white
Interior material: white

Sizes

12” x 12” x 2.25” - Falls within USPS Tier 3 Shipping Rates

Dimensions, inside: 12” x 12” x 2.25”
Dimensions, outside*: 13” x 12.313” x 2.375”
Weight in ounces: 8 ounces
USPS Tier: .22ft³ or Tier 3

* all outside dimensions are approximate and will vary just slightly based on assembly

Our Process

We digitally print your art on our corrugated board in CMYK, often referred to as 4-color process, ink with a UV cure. The UV cure ensures your art is set to withstand basic elements and won't rub off. Our printers are calibrated to SWOP standards, but no two digital printers are the same and we cannot match a PMS color. If color matters to you, please explore our proof options.

Proof and Sample Options

If seeing a proof is important to you, we offer three options:

1. Color Test:

If you are trying to match a color, we strongly suggest using our color sampler to identify the color match you are looking for. Still see a color missing? Chat with a customer service rep and we'll see if we can add the color for you.

2. Proof:

You can always order a quantity of one with BoxUp. This is the best way to see your art. Turn times for proof orders will vary, please chat with us if you have a specific deadline and we'll mark it on your order.

3. Printed or Blank Samples:

If you are just looking to see the quality of our printing, in general, or you are looking to have an extra blank thrown in with your proof order, you can order a sample product here.

Product Guarantee

We take full responsibility for the quality of the product. If you are ever dissatisfied with the quality, reach out to us immediately. Our terms and conditions outline our policies on refunds and reprints. Our product is 100% custom. Because of this, we expect our customer to take responsibility for the art product itself. If you want to be sure the end product turns out exactly how you wanted it to, we strongly recommend that you purchase a proof before you place a full order.

Sustainability Promise

At BoxUp, we value the role we play in supporting environmental and sustainable practices. Our raw material is supplied by companies certified by the Sustainable Forestry Initiative, (SFI). SFI is the largest single forest standard in the world – a standard backed by continuous research. Our commitment ensures that our boxes are made from at least 50% recycled material and are 100% recyclable. Furthermore, since we manufacture, print and ship all our boxes from Terre Haute, Indiana, you can rest assured that your boxes will have a minimized eco-footprint (not to mention a faster turn-around time!)

Shipping

All boxes are printed and shipped from our facility in Terre Haute, IN. UPS ground shipping is our default. Our boxes are packed in a corrugated cardboard box usually no more than 50 pounds each. You will receive a shipping notification when your order is being processed for shipping. Please allow 24 hours for the tracking number to populate your shipping information. Expedited shipping is available on the shipping calculator. If you require special shipping instructions such as blind shipping, a house UPS account or an alternate shipping arrangement, you must reach out to customers service to approve and process your request.