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Order summary:
Custom Mailer Boxes
Quantity: x5 | Paper Size: 100 x 100 x 22mm | Material: White Coated E-Flute | Print Area: Single Sided | Finishing Types: Cut to Shape |
Artwork Technical Check: Essential - FREE
Unparalleled knowledge,See what our customers say about Custom Mailer Boxes
Product description
Reinvent shipping experiences with our custom Mailer Boxes, where each delivery becomes an opportunity to impress. Whether handling your Etsy shipping, delivering gifts or sending promotional items, these boxes are built to make a statement from the outside.
Available in three sizes—and made from durable white coated E-flute, our parcel boxes are designed to both look stylish and withstand the journey. Choose single sided printing to personalise your letterbox packaging and ensure your messaging shines the moment it arrives at your customer's doorstep.
Perfect for businesses looking to make an impact with their deliveries, our mailer boxes blend practicality with style, creating a lasting impression long after the box has been opened. Make your personalised postal boxes not just functional but unforgettable.
Etsy deliveries, parcel shipping, promotional giveaways, custom subscription boxes and more.
Top tip
Take your packaging to the next level by printing on the outside of your custom mailer boxes. This creates a seamless, all-around branded experience that surprises and impresses your customers from the moment they open the box.
Looking for more ways to elevate your packaging? Discover our wide range of custom packaging solutions.
Design guidelines
To make artwork setup simple, we recommend downloading the relevant template from the 'Product Templates' section above. Don’t forget to follow the template instructions and delete the 'guide' layer before exporting your design to a PDF.
For best printing results, ensure your artwork and images are CMYK. If you use RGB, Pantone or spot colours in any element of your artwork, we will automatically convert them to CMYK which may change your colour profile.
To eliminate any font issues, make sure all fonts are ‘embedded’ or ‘converted to outlines’ before creating your PDF print file. To ensure legibility, we recommend using a minimum font size of 10pt.
For optimal image print quality, ensure all images are 300dpi to 450dpi. Anything lower than 300dpi will give poor image quality. Images higher than 450dpi will result in high file sizes and may cause longer upload times.
To avoid alignment issues during cutting, be sure to include ‘crop marks’ (offset 10mm) and ‘document bleed’ when exporting your artwork file to PDF. Refer to our product templates for the required bleed specifications.
To meet our print requirements, ensure your file is exported in Adobe PDF (Print) format, ideally as PDF/X-1a: 2001.
Need further guidance? Our help centre is here to provide the answers.
How to print with Canva
We provide free Canva templates for many of our products to make artwork setup quick and print-ready. If this product shows a Canva symbol above, click it to open the correct template in Canva. Each template includes the right size, bleed and safe zones. After designing and downloading, return here to order your product.
If you do not see a Canva option here, you can still browse our full collection of Canva-compatible templates to find products that work.
A new tab will open with the template preloaded for you. Be sure to remove the template guides before exporting your final file.
Set your design to CMYK for the most accurate print results. RGB files will be converted to CMYK, and colours may change slightly.
Use fonts available in Canva at 10pt or larger. Keep all text within the safe area to ensure legibility after trimming.
Upload high resolution images (300 DPI or higher). Lower resolution files may look blurry or pixelated when printed.
Extend backgrounds or images into the bleed area to avoid white edges. Keep important text and logos inside the safe zone.
Export from Canva as PDF Print and select 'Crop Marks and Bleed' before downloading. After your artwork is finalised and downloaded, be sure to upload it when placing your order with WTTB.
If you need more help, visit our Canva Hub for step-by-step guides on creating and exporting print-ready designs in Canva.
Product description
Reinvent shipping experiences with our custom Mailer Boxes, where each delivery becomes an opportunity to impress. Whether handling your Etsy shipping, delivering gifts or sending promotional items, these boxes are built to make a statement from the outside.
Available in three sizes—and made from durable white coated E-flute, our parcel boxes are designed to both look stylish and withstand the journey. Choose single sided printing to personalise your letterbox packaging and ensure your messaging shines the moment it arrives at your customer's doorstep.
Perfect for businesses looking to make an impact with their deliveries, our mailer boxes blend practicality with style, creating a lasting impression long after the box has been opened. Make your personalised postal boxes not just functional but unforgettable.
Etsy deliveries, parcel shipping, promotional giveaways, custom subscription boxes and more.
Top tip
Take your packaging to the next level by printing on the outside of your custom mailer boxes. This creates a seamless, all-around branded experience that surprises and impresses your customers from the moment they open the box.
Looking for more ways to elevate your packaging? Discover our wide range of custom packaging solutions.
Design guidelines
To make artwork setup simple, we recommend downloading the relevant template from the 'Product Templates' section above. Don’t forget to follow the template instructions and delete the 'guide' layer before exporting your design to a PDF.
For best printing results, ensure your artwork and images are CMYK. If you use RGB, Pantone or spot colours in any element of your artwork, we will automatically convert them to CMYK which may change your colour profile.
To eliminate any font issues, make sure all fonts are ‘embedded’ or ‘converted to outlines’ before creating your PDF print file. To ensure legibility, we recommend using a minimum font size of 10pt.
For optimal image print quality, ensure all images are 300dpi to 450dpi. Anything lower than 300dpi will give poor image quality. Images higher than 450dpi will result in high file sizes and may cause longer upload times.
To avoid alignment issues during cutting, be sure to include ‘crop marks’ (offset 10mm) and ‘document bleed’ when exporting your artwork file to PDF. Refer to our product templates for the required bleed specifications.
To meet our print requirements, ensure your file is exported in Adobe PDF (Print) format, ideally as PDF/X-1a: 2001.
Need further guidance? Our help centre is here to provide the answers.
How to print with Canva
We provide free Canva templates for many of our products to make artwork setup quick and print-ready. If this product shows a Canva symbol above, click it to open the correct template in Canva. Each template includes the right size, bleed and safe zones. After designing and downloading, return here to order your product.
If you do not see a Canva option here, you can still browse our full collection of Canva-compatible templates to find products that work.
A new tab will open with the template preloaded for you. Be sure to remove the template guides before exporting your final file.
Set your design to CMYK for the most accurate print results. RGB files will be converted to CMYK, and colours may change slightly.
Use fonts available in Canva at 10pt or larger. Keep all text within the safe area to ensure legibility after trimming.
Upload high resolution images (300 DPI or higher). Lower resolution files may look blurry or pixelated when printed.
Extend backgrounds or images into the bleed area to avoid white edges. Keep important text and logos inside the safe zone.
Export from Canva as PDF Print and select 'Crop Marks and Bleed' before downloading. After your artwork is finalised and downloaded, be sure to upload it when placing your order with WTTB.
If you need more help, visit our Canva Hub for step-by-step guides on creating and exporting print-ready designs in Canva.
Custom mailer boxes are sturdy, packaging solutions made from corrugated cardboard, tailored to fit specific branding needs. They feature a self-locking mechanism for easy assembly and come in various sizes. These boxes are perfect for shipping merchandise and gifts, providing protection during transit to ensure they arrive in excellent condition.
100 x 100 x 22mm: This small postal box meets Royal Mail's large letter size requirements, perfect for compact items.
255 x 168 x 22mm: This medium postal box meets Royal Mail's large letter size requirements, suitable for medium sized items.
600 x 182 x 35mm: This large postal box meetings Royal Mail's medium parcel size requirements, well-suited for larger items.
All of the aforementioned sizes are designed to comply with Royal Mail size requirements; however it is important to remember that letterbox sizes can vary on individual doors, so be sure to keep this in mind when choosing a specific size.
E-flute: This lightweight reinforced board features a smooth, bright white surface, making it an ideal choice for printed postal boxes.
Custom postal boxes are supplied flat for easy self-assembly. To assemble, begin by folding along the pre-scored lines on the cardboard. Next, insert the interlocking tabs into their corresponding slots to secure the box’s structure. Once the tabs are locked in place, fold the top and bottom flaps over and tuck them in to close the box. Make sure all edges are aligned properly and the box is securely sealed before use.
Yes, our postal boxes are recyclable since they are constructed from corrugated cardboard. To recycle them properly, remove any contents, clean off any residue, and flatten the box. Always check local recycling guidelines, as practices may vary by region.
The turnaround time for personalised postal boxes depends on your chosen product specification and finishing options. For faster delivery, we offer express production upgrades at an additional cost. To ensure your order is delivered on time, it is important we receive your artwork by the cut-off time indicated on both the product page and basket.
Please note: If your file is submitted after the cut-off time or if corrected artwork isn't provided before the next cut-off time following rejection, it will delay delivery by one working day.
We offer free standard delivery, with optional upgrades available for expedited service, including pre-10:30 AM and pre-12:00 PM for an additional cost.
Yes, we offer international delivery. Contact our Bespoke team for a shipping quote.
Yes, we can arrange split deliveries. Contact our Bespoke team to let us know how you'd like your order sent.
Uploading custom mailer box artwork is a breeze. After placing your order, click the upload button on the confirmation page. You can also upload your artwork through the Orders tab of "My Account".
Most orders are sent in boxes. For larger quantities, we may secure your order on a pallet (kerbside delivery). If your location doesn’t have tail-lift access, please contact us after placing your order so we can help arrange the best delivery option. Be sure to have your order number to hand.
Custom mailer boxes are sturdy, packaging solutions made from corrugated cardboard, tailored to fit specific branding needs. They feature a self-locking mechanism for easy assembly and come in various sizes. These boxes are perfect for shipping merchandise and gifts, providing protection during transit to ensure they arrive in excellent condition.
100 x 100 x 22mm: This small postal box meets Royal Mail's large letter size requirements, perfect for compact items.
255 x 168 x 22mm: This medium postal box meets Royal Mail's large letter size requirements, suitable for medium sized items.
600 x 182 x 35mm: This large postal box meetings Royal Mail's medium parcel size requirements, well-suited for larger items.
All of the aforementioned sizes are designed to comply with Royal Mail size requirements; however it is important to remember that letterbox sizes can vary on individual doors, so be sure to keep this in mind when choosing a specific size.
E-flute: This lightweight reinforced board features a smooth, bright white surface, making it an ideal choice for printed postal boxes.
Custom postal boxes are supplied flat for easy self-assembly. To assemble, begin by folding along the pre-scored lines on the cardboard. Next, insert the interlocking tabs into their corresponding slots to secure the box’s structure. Once the tabs are locked in place, fold the top and bottom flaps over and tuck them in to close the box. Make sure all edges are aligned properly and the box is securely sealed before use.
Yes, our postal boxes are recyclable since they are constructed from corrugated cardboard. To recycle them properly, remove any contents, clean off any residue, and flatten the box. Always check local recycling guidelines, as practices may vary by region.
The turnaround time for personalised postal boxes depends on your chosen product specification and finishing options. For faster delivery, we offer express production upgrades at an additional cost. To ensure your order is delivered on time, it is important we receive your artwork by the cut-off time indicated on both the product page and basket.
Please note: If your file is submitted after the cut-off time or if corrected artwork isn't provided before the next cut-off time following rejection, it will delay delivery by one working day.
We offer free standard delivery, with optional upgrades available for expedited service, including pre-10:30 AM and pre-12:00 PM for an additional cost.
Yes, we offer international delivery. Contact our Bespoke team for a shipping quote.
Yes, we can arrange split deliveries. Contact our Bespoke team to let us know how you'd like your order sent.
Uploading custom mailer box artwork is a breeze. After placing your order, click the upload button on the confirmation page. You can also upload your artwork through the Orders tab of "My Account".
Most orders are sent in boxes. For larger quantities, we may secure your order on a pallet (kerbside delivery). If your location doesn’t have tail-lift access, please contact us after placing your order so we can help arrange the best delivery option. Be sure to have your order number to hand.
