{"id":27635,"date":"2021-01-20T20:11:05","date_gmt":"2021-01-20T20:11:05","guid":{"rendered":"https:\/\/suprefreshprod.wpengine.com\/\/?page_id=27635"},"modified":"2026-03-19T13:08:47","modified_gmt":"2026-03-19T18:08:47","slug":"understanding-envelope-sizes","status":"publish","type":"post","link":"https:\/\/smartpress.com\/support\/product-resources\/understanding-envelope-sizes","title":{"rendered":"Understanding Envelope Sizes"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Envelope Sizes &amp; Why They Matter for Your Mailing Needs<\/h2>\n\n\n\n<p>Whether you\u2019re sending custom <a href=\"https:\/\/smartpress.com\/offering\/invitation-printing\">invitations<\/a>, letters to donors or corporate communications, understanding envelope sizes can be a big help. After all, envelopes are part of your marketing package, making that all-important first impression.<\/p>\n\n\n\n<p>As a premium online printer, Smartpress offers more than just standard envelope sizes, so you can conveniently mail anything with the right look, from professional to personalized.<\/p>\n\n\n\n<section class=\"waypoint t-sink s-sink\" id=\"envelopes-sizes-for-personal-special-events\">\n    \n\n<h2 class=\"wp-block-heading\">Envelope Sizes for Personal &amp; Special Events<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Envs.jpg?auto=format%2Ccompress&fit=crop&h=668&ixlib=php-3.3.0&w=1024&s=fbd4b17898c220ceaffb31157217885e\" alt=\"Four envelopes in different sizes lined up with their names and specs.\" class=\"wp-image-29693\" srcset=\"https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=668&amp;ixlib=php-3.3.0&amp;w=1024&amp;s=fbd4b17898c220ceaffb31157217885e 1024w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=196&amp;ixlib=php-3.3.0&amp;w=300&amp;s=a0b8ca798e67ca8d61e106129a9cf6ae 300w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=501&amp;ixlib=php-3.3.0&amp;w=768&amp;s=f84d0cb76755f765adc86d1978b485ac 768w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=1002&amp;ixlib=php-3.3.0&amp;w=1536&amp;s=27ec07ab8b03324b0a8af07e7b3b9a99 1536w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Envs.jpg?auto=format%2Ccompress&amp;ixlib=php-3.3.0&amp;w=1725&amp;s=232b088ce9327a55d94891fe5f3784f4 1725w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<p>When you think custom envelopes, you think events. From birthdays and anniversaries to weddings, fundraisers, galas and more, envelopes for <a href=\"https:\/\/smartpress.com\/offering\/announcement-printing\">announcements<\/a> and <a href=\"https:\/\/smartpress.com\/offering\/card-printing\">cards<\/a> are a must. With Smartpress, you can design and print your own envelopes to suit any occasion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A1 Envelope Dimensions (3.625\u201d x 5.125\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Very common envelope size for the traditional 3.5\u201d x 5\u201d RSVP cards<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.5-1.81&#8243;H x 5.125&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">A2 Envelope Dimensions (4.375\u201d x 5.75\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fits any card or invitation sized up to a 4.25\u201d x 5.5\u201d<\/li>\n\n\n\n<li>Common for invitations, <a href=\"https:\/\/smartpress.com\/offering\/greeting-card-printing\">greeting cards<\/a>, <a href=\"https:\/\/smartpress.com\/offering\/thank-you-card-printing#c=245&amp;cp=1\">thank you cards<\/a><\/li>\n\n\n\n<li>Designed for <a href=\"https:\/\/smartpress.com\/shop\/direct-mail-letters\">letters<\/a> that are quarter-folded<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.75-2.25&#8243;H x 5.75&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">A6 Envelope Dimensions (4.75\u201d x 6.5\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fits any card or invitation sized up to a 4.5\u201d x 6.25\u201d<\/li>\n\n\n\n<li>Great for traditional-sized <a href=\"https:\/\/smartpress.com\/offering\/wedding-invitation-printing#c=245&amp;cp=1\">wedding invitations<\/a> and <a href=\"https:\/\/smartpress.com\/offering\/save-the-date-printing#c=245&amp;cp=1\">save the date cards<\/a><\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 2.06-2.5&#8243;H x 6\/5&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">A7 Envelope Dimensions (5.25\u201d x 7.25\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fits any card or invitation sized up to 5\u201d x 7\u201d<\/li>\n\n\n\n<li>Commonly used for the outer (mailer) envelope for wedding invitations<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 2.125-2.5&#8243;H x 7.25&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n<\/section>\n\n\n\n<section class=\"waypoint t-sink s-sink\" id=\"envelope-sizes-for-businesses-corporations\">\n    \n\n<h2 class=\"wp-block-heading\">Envelope Sizes for Businesses &amp; Corporations<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Business-Envs-1024x661.jpg?auto=format%2Ccompress&fit=crop&h=661&ixlib=php-3.3.0&w=1024&s=d16ebacb36bb77987dca79a5a5e57d96\" alt=\"Four business envelopes in different sizes lined up with their names and specs.\" class=\"wp-image-29691\" srcset=\"https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Business-Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=661&amp;ixlib=php-3.3.0&amp;w=1024&amp;s=cac6e2ad5dde04b9b8904ad90735ac11 1024w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Business-Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=194&amp;ixlib=php-3.3.0&amp;w=300&amp;s=8dfee3b43d16a36dc6258315b3d0bcf5 300w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Business-Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=496&amp;ixlib=php-3.3.0&amp;w=768&amp;s=d0605cbd5e40443d3f2e1fc56a545f1b 768w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Business-Envs.jpg?auto=format%2Ccompress&amp;fit=crop&amp;h=991&amp;ixlib=php-3.3.0&amp;w=1536&amp;s=db90a6c6a87f62d9d8a8b68c9608ecaf 1536w, https:\/\/smartpresssupport.imgix.net\/support\/wp-content\/uploads\/2022\/09\/Business-Envs.jpg?auto=format%2Ccompress&amp;ixlib=php-3.3.0&amp;w=1743&amp;s=b21c7bcea79f9551411f8d5e389a570b 1743w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<p>No matter the size of your business or organization, business stationery is essential, and that includes envelope printing. Perfect for sending updates to donors, communication to employees, direct mail marketing and more, these envelope sizes help you send the right message.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">#6-3\/4 Remittance Envelope Dimensions (3.625\u201d x 6.5\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 3.375\u201d x 6.25\u201d<\/li>\n\n\n\n<li>Donation envelopes used for fundraising, money collection and charity donation<\/li>\n\n\n\n<li>Sizable flap allows for printing on the inside<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 3.437&#8243;H x 6.5&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">#9 Envelope Dimensions  (3.875\u201d x 8.875\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 3.625\u201d x 8.625\u201d<\/li>\n\n\n\n<li>Commonly used for reply envelopes and sending money or donations<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.875&#8243;H x 8.875&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">#9 Remittance Envelope Dimensions (3.875\u201d x 8.875\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 3.625\u201d x 8.625\u201d<\/li>\n\n\n\n<li>Commonly used for reply envelopes and sending money or donations<\/li>\n\n\n\n<li>Sizable flap allows for printing on the inside<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 3.687&#8243;H x 8.875&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">#10 Envelope Dimensions (4.125\u201d x 9.5\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 3.875\u201d x 9.25\u201d<\/li>\n\n\n\n<li>Commonly paired with a tri-fold letter<\/li>\n\n\n\n<li>Popular business envelope for traditional and <a href=\"https:\/\/smartpress.com\/shop\/direct-mail-printing\">direct mail<\/a><\/li>\n\n\n\n<li>Flap type: V-shape<\/li>\n\n\n\n<li>Flap dimensions: 1.875&#8243;H (at V point) x 9.5&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">#10 Window Envelope Dimensions (4.125\u201d x 9.5\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 3.875\u201d x 9.25\u201d<\/li>\n\n\n\n<li>Commonly paired with a tri-folded letter<\/li>\n\n\n\n<li>Popular corporate envelope for traditional and direct mail<\/li>\n\n\n\n<li>Typically used to display the recipient\u2019s mailing address through the window opening on the left side<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.5&#8243;H x 9.5&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">#10 Window Security Envelope Dimensions (4.125\u201d x 9.5\u201d)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 3.875\u201d x 9.25\u201d<\/li>\n\n\n\n<li>Commonly paired with a tri-fold letter<\/li>\n\n\n\n<li>Popular business envelope for traditional and direct mail<\/li>\n\n\n\n<li>Typically used to display the recipient\u2019s mailing address through the window opening on the right side<\/li>\n\n\n\n<li>Includes a tinted pattern inside the envelope that reduces visibility of seeing sensitive information through the envelope itself<\/li>\n\n\n\n<li>Flap type: V-shape<\/li>\n\n\n\n<li>Flap dimensions: 1.875&#8243;H (at V point) x 9.5&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n<\/section>\n\n\n\n<section class=\"waypoint t-sink s-sink\" id=\"common-envelope-sizes-for-catalogs-booklets\">\n    \n\n<h2 class=\"wp-block-heading\">Common Envelope Sizes for Catalogs &amp; Booklets<\/h2>\n\n\n\n<p>For many who make online printing part of their marketing strategy, <a href=\"https:\/\/smartpress.com\/shop\/custom-booklets\">custom booklets<\/a> are important promotional pieces. Whether you send product catalogs to customers or mail annual reports to shareholders, slip them into an envelope for protection.<\/p>\n\n\n\n<p><strong><em>Smartpress Tip:<\/em><\/strong> These larger envelope sizes also make it easy to include inserts like <a href=\"https:\/\/smartpress.com\/shop\/business-card-printing\">business cards<\/a>, <a href=\"https:\/\/smartpress.com\/offering\/brochure-printing\">brochures<\/a> and other marketing collateral that enhance the unboxing experience and multiply your marketing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6&#8243; x 9&#8243; Open Side Envelope<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 5.75\u201d x 8.75\u201d<\/li>\n\n\n\n<li>Commonly used for mailing documents, letters and reports that are folded in half<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.5&#8243;H x 9&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6&#8243; x 9.5&#8243; Open Side Envelope<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 5.75\u201d x 9.25\u201d<\/li>\n\n\n\n<li>Commonly used for mailing documents, letters and reports that are folded in half<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.5&#8243;H x 9.5&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">9&#8243; x 12&#8243; Open Side Envelope<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 8.75\u201d x 11.75\u201d<\/li>\n\n\n\n<li>Great for mailing flat documents, <a href=\"https:\/\/smartpress.com\/shop\/custom-booklets\">booklets<\/a> and reports<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.437&#8243;H x 12&#8243;W<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">10&#8243; x 13&#8243; Open Side Envelope<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum enclosure size: 9.75\u201d x 12.75\u201d<\/li>\n\n\n\n<li>Great for mailing flat documents, booklets and reports<\/li>\n\n\n\n<li>Flap type: Square<\/li>\n\n\n\n<li>Flap dimensions: 1.5&#8243;H x 13&#8243;W<\/li>\n\n\n\n<li>Flap location: Along the width (long end)<\/li>\n<\/ul>\n\n\n<\/section>\n\n\n\n<section class=\"waypoint t-sink s-sink\" id=\"envelope-inserting-services\">\n    \n\n<h2 class=\"wp-block-heading\">Smartpress&#8217; Envelope Inserting Services<\/h2>\n\n\n\n<p>As part of our wide range of online printing services, we can insert printed pieces (letters, cards, invitations, etc.) into envelopes for you. This can be especially helpful and save you time for direct mailings and business or corporate communications.<\/p>\n\n\n\n<p><strong><em>Smartpress Tip:<\/em><\/strong> Any printed piece that gets inserted by machine must be 1\/2&#8243; shorter in width and 1\/4&#8243; shorter in height than the envelope. If your piece does not follow these guidelines, it must be inserted by hand, which includes additional fees and extends turnaround time.<\/p>\n\n\n<\/section>\n\n\n\n<section class=\"waypoint t-sink s-sink\" id=\"envelope-sizes-summary-table\">\n    \n\n<h2 class=\"wp-block-heading\">Envelope Sizes Summary Table<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Envelope <br>Type<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Envelope Dimensions&nbsp;<br>(W \u00d7 H)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Flap Dimensions&nbsp;<\/strong><br><strong>(H \u00d7 W)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><br><strong>Maximum <br>Insert Size<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>A1<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">3.625\u2033 \u00d7 5.125\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.5\u2033 &#8211; 1.81\u2033 \u00d7 5.125\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.5\u2033 \u00d7 5\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>A2<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">4.375\u2033 \u00d7 5.75\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.75\u2033 &#8211; 2.25\u2033 \u00d7 5.75\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.25\u2033 \u00d7 5.5\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>A6<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">4.75\u2033 \u00d7 6.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.06\u2033 &#8211; 2.5\u2033 \u00d7 6.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.5\u2033 \u00d7 6.25\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>A7<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">5.25\u2033 \u00d7 7.25\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.125\u2033 &#8211; 2.5\u2033 \u00d7 7.25\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">5\u2033 \u00d7 7\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>#6-3\/4 Remittance<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">3.625\u2033 \u00d7 6.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.437\u2033 \u00d7 6.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.375\u2033 \u00d7 6.25\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>#9<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">3.875\u2033 \u00d7 8.875\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.875\u2033 \u00d7 8.875\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.625\u2033 \u00d7 8.625\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>#9 Remittance<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">3.875\u2033 \u00d7 8.875\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.687\u2033 \u00d7 8.875\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.625\u2033 \u00d7 8.625\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>#10<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">4.125\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.875\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.875\u2033 \u00d7 9.25\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>#10 Window<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">4.125\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.5\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.875\u2033 \u00d7 9.25\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>#10 Window Security<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">4.125\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.875\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.875\u2033 \u00d7 9.25\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>6\u2033 \u00d7 9\u2033 Open Side<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">6\u2033 \u00d7 9\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.5\u2033 \u00d7 9\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">5.75\u2033 \u00d7 8.75\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>6\u2033 \u00d7 9.5\u2033 Open Side<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">6\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.5\u2033 \u00d7 9.5\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">5.75\u2033 \u00d7 9.25\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>9\u2033 \u00d7 12\u2033 Open Side<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">9\u2033 \u00d7 12\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.437\u2033 \u00d7 12\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.75\u2033 \u00d7 11.75\u2033<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>10\u2033 \u00d7 13\u2033 Open Side<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">10\u2033 \u00d7 13\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.5\u2033 \u00d7 13\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">9.75\u2033 \u00d7 12.75\u2033<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<\/section>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>For envelope mailing information, visit <a href=\"https:\/\/smartpress.com\/support\/direct-mail\/mailing-design-guidelines\">Mailing Design Guidelines<\/a>. If you have questions about envelope sizes, please <a href=\"https:\/\/smartpress.com\/support\/contact\">contact customer service<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Envelope Sizes &amp; Why They Matter for Your Mailing Needs Whether you\u2019re sending custom invitations, letters to donors or corporate communications, understanding envelope sizes can be a big help. After all, envelopes are part of your marketing package, making that all-important first impression. As a premium online printer, Smartpress offers more than just standard envelope [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":29849,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[545],"tags":[],"class_list":["post-27635","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-resources"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Understanding Envelope Sizes | Support<\/title>\n<meta name=\"description\" content=\"Smartpress offers a variety of envelope sizes to complete your mailing. 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