Optimize Envelope Size for a Successful Direct Mail Campaign | Envelope Manufacturer in New York
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- Jul 10, 2025
- 2 min read

When it comes to envelope size for your direct mail campaign, all sizes are not created equal. To get the most out of your campaign’s budget and reach, it is important to choose the right size envelope. Mercury Envelope & Printing, the top envelope manufacturer in New York, is here to help you select the best envelope option for your needs.
What Size Mailpiece Should You Choose?
One of the very first – and possibly most difficult – decisions when creating a direct mail campaign is what size the mailer will be. The size of your mailpiece is a determining factor in your costs. It will ascertain how much you spend in postage. And it will impact how much space you have to communicate your message.
Maximize Your Budget With One of the Common Envelope Sizes
As your direct mail envelope manufacturer in New York, Mercury Envelope & Printing can help you choose the right size mailer for your budget and messaging requirements. To keep postal costs within budget, we can provide customized, standard-sized envelopes. The most common mailpiece sizes are below:
Postcard
Length = 5 to 6 inches
Width = 3.5 to 4.25 inches
Thickness = 0.007 to 0.016 inches
Letter
Length = 5 to 11.5 inches
Width = 3.5 to 6.125 inches
Thickness = 0.007 to 0.25 inches
Flat
One dimension greater than 11.5” long OR 6.125” wide OR 0.25” thick
Must not exceed 15” long by 12” wide by 0.75” thick
Full-Service Printer and Envelope Manufacturer in New York
Mercury Envelope & Printing is an experienced, full-service direct mail printer and packaging provider. We have over 125 years of experience in the direct mail fulfillment industry. We are ready to source, print, fulfill, and deliver all of your direct mail packages, match campaigns, membership cards, corporate rewards programs, annual reports, and more. We are your printer and envelope manufacturer in New York, and we deliver nationwide. Contact us today for a free quote.





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