While the United States Postal Service (USPS) offers a variety of mailing boxes, they don't typically carry boxes specifically labeled as "poster boxes." However, you can find long, flat shipping tubes and rectangular boxes at many USPS locations that work well for mailing posters, artwork, or large prints. If you need a box with more specific dimensions or extra protection, retailers like Walmart carry poster boxes designed for moving or shipping flat items safely. Always check the size requirements for your shipment to make sure your poster fits securely and arrives in good shape.

Boxes designed for shipping or storing posters are often called poster boxes, artwork boxes, or picture moving boxes. Some are also referred to as mirror boxes because they're suitable for flat, fragile items like mirrors, framed prints, and posters. These boxes are typically long, flat, and sturdy to help prevent bending or creasing during transport. When shopping online or in-store, look for these terms to find the right size and style for your needs.

There are a few ways to find free cardboard boxes for shipping posters or other items:

• Check with local retailers or grocery stores, as they often have spare boxes they're willing to give away.
• Ask at office supply or print shops, which may have extra shipping boxes.
• Look for community groups online where people give away moving supplies.

If you need a specific size or extra protection for posters, consider purchasing new poster boxes from Walmart for added convenience and peace of mind.

Choosing the right size poster box depends on the dimensions of your poster or artwork. Here are some tips:

• Measure your poster's length, width, and depth (if framed).
• Select a box slightly larger than your item to allow for protective padding like bubble wrap or packing paper.
• For rolled posters, a tube or long rectangular box works well.
• For flat or framed pieces, look for flat, sturdy boxes designed for artwork or mirrors.

Walmart offers a range of poster boxes in different sizes to help you find the best fit for your project.

To help keep your posters safe during shipping or moving, try these tips:

• Roll posters loosely and secure with a soft band if using a tube, or keep them flat between sturdy boards for flat boxes.
• Use acid-free tissue paper to protect the surface from scratches.
• Fill any empty space in the box with packing material to prevent shifting.
• Seal the box securely with strong packing tape.

Taking these steps can help reduce the risk of creases or tears while your poster is in transit.