{"id":247029,"date":"2018-03-28T00:00:00","date_gmt":"2018-03-28T00:00:00","guid":{"rendered":"https:\/\/www.stamps.com\/?p=247029"},"modified":"2025-11-13T15:18:25","modified_gmt":"2025-11-13T15:18:25","slug":"how-to-ship-flats-with-stamps-com","status":"publish","type":"post","link":"https:\/\/www.stamps.com\/article\/how-to-ship-flats-with-stamps-com\/","title":{"rendered":"How To Ship Flats With Stamps.com"},"content":{"rendered":"\n<figure class=\"wp-block-image aligncenter\"><a href=\"https:\/\/www.stamps.com\/wp-content\/uploads\/2024\/05\/How-To-Ship-Flats-With-Stamps.com_Blog.jpg\"><img decoding=\"async\" src=\"https:\/\/www.stamps.com\/wp-content\/uploads\/2024\/05\/How-To-Ship-Flats-With-Stamps.com_Blog.jpg\" alt=\"How To Ship Flats With Stamps.com_Blog\" class=\"wp-image-5582\"\/><\/a><\/figure>\n\n\n\n<p>If you need to send a manuscript, set of reports, or sheaf of bills, you&#8217;re going to need something a bit larger than a normal letter-sized envelope. The USPS recognizes a category of <em>Flats<\/em> which can comfortably house numerous sheets of paper, magazines, journals, books or other material, without needing to fold the items.<\/p>\n\n\n\n<p>The key thing to remember is that flats must <strong><span style=\"text-decoration: underline;\">always<\/span><\/strong> be flexible and uniformly even and smooth with no large bumps.&nbsp; Are you sending a license plate in an envelope?&nbsp; Is your envelope wrapped so tightly in plastic that it can\u2019t even bend anymore?&nbsp; Are you sending a box or parcel?&nbsp; Then none of these mailpieces would be considered flats.<\/p>\n\n\n\n<p>The USPS maintains a consisting standard to determine whether something is considered flexible or not.&nbsp; The official \u201c<strong>flexibility test<\/strong>\u201d states that a mailpiece is considered flexible \u201cif both ends can bend at least 1 inch vertically without being damaged.\u201d&nbsp; The USPS has a useful <a href=\"http:\/\/pe.usps.com\/text\/dmm300\/201.htm#1096362\">guide<\/a> that shows you how you can perform your own Flex Test.<\/p>\n\n\n\n<p>The official definition of a flat is that it must have a minimum height of 6-1\/8&#8243; and a maximum height of 12&#8243;, and a minimum length of 11-1\/2&#8243; and a maximum length of 15&#8243;.&nbsp; The minimum thickness is \u00bc&#8221; and the maximum thickness is \u00be&#8221;.&nbsp; Anything exceeding these measurements will be bumped up to the next mailpiece of Thick Envelope\/Parcel.<\/p>\n\n\n\n<p>Besides the standards by which there is a minimum and maximum thickness for flats, there are two other regulations to consider:<\/p>\n\n\n\n<p><strong>&#8211; The \u00bc Protuberance Rule<\/strong><br>\u00be of an inch thick is the maximum thickness for flats, but keep in mind that there is an <strong>additional and separate regulation <\/strong>regarding uniform thickness.&nbsp; Your flat has to be uniformly&nbsp;thick, so it can\u2019t have any bumps, protrusions, or bulges&nbsp;that cause more than a \u00bc-inch variance in thickness.&nbsp; Even if your flat is less than \u00be inch thick, it may not always be a flat.&nbsp; If it contains an item inside of it that is creating a bump that is more than \u00bc inch thick, then the mailpiece <span style=\"text-decoration: underline;\">would not be considered a flat<\/span>.&nbsp; Therefore, the key thing to prevent is from the mailpiece becoming nonuniformly thick with bumps, bulges, lumps, and prominences.<\/p>\n\n\n\n<p><strong>&#8211; Content Shifting<\/strong><br>Because of these thickness and protuberance rules, flats are best used for sending documents, but if you want to use flats for non-paper contents, you should secure the items to prevent shifting.&nbsp; This is because there is an additional postal rule that states that non-paper contents cannot move inside the flat to such a degree that they would create a bump or protrusion, or cause the items to burst out of the flat.&nbsp; The official maximum for content shifting is 2 inches, so your items cannot move inside the flat for more than that distance. &nbsp;&nbsp;<strong>&nbsp;<\/strong><\/p>\n\n\n\n<p><strong>Sending Flats With Stamps.com<\/strong><br>Stamps.com makes it easy to send to flats!&nbsp; You can <a href=\"https:\/\/www.stamps.com\/mail\/print-stamps-online\/\">print postage<\/a> for flats in a number of different ways depending on how much information you want on your label.<\/p>\n\n\n\n<p><strong>#1. Need just a stamp?&nbsp; <\/strong><br>In your Stamps.com software, select \u201cStamps\u201d on the left side of the screen and then select \u201cLarge Envelopes and Flats\u201d under the drop-down Mailpiece menu.&nbsp; You can then select your mail class as First Class (up to 13 oz.).<\/p>\n\n\n\n<p><strong>#2. Want to print postage for a Flat with the delivery and return addresses included?&nbsp; <\/strong><br>In your Stamps.com software, select \u201cEnvelopes\u201d on the left side of the screen and then select \u201cLarge Envelopes and Flats\u201d under the drop-down Mailpiece menu.&nbsp; You can print to a wide variety of labels, such as SDC-3110 or Avery labels like Avery 32403.<\/p>\n\n\n\n<p><strong>#3. Printing First Class, Priority Mail and Priority Mail Express Shipping Labels for Flats?<\/strong><br>Find these mail class options under the \u201cPackages\u201d option on the left side of the screen.&nbsp; Just look for the mailpiece called \u201cLarge Envelope\/Flat.\u201d&nbsp; These can be printed on plain paper, Stamps.com labels such as the SDC-1200, or Avery labels like Avery 32402.&nbsp; &nbsp;Tracking is available for Priority and Priority Express Shipping Labels for Flats.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-ship-flats-with-stamps-com-step-by-step\">How to Ship Flats with Stamps.com (Step\u2011by\u2011Step)<\/h2>\n\n\n\n<p>Flats (large envelopes) offer a cost-effective way to ship large, thin items through USPS. Follow these steps using Stamps.com:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-1-select-envelopes-and-then-large-envelopes-amp-flats\"><strong>Step 1: Select \u201cEnvelopes\u201d and then \u201cLarge Envelopes &amp; Flats\u201d<\/strong><\/h3>\n\n\n\n<p><strong><br><\/strong> In Stamps.com software, click \u201cEnvelopes\u201d from the left menu, and under the \u201cMailpiece\u201d dropdown, choose \u201cLarge Envelopes &amp; Flats.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-2-choose-your-mail-class\"><strong>Step 2: Choose your mail class<\/strong><\/h3>\n\n\n\n<p><strong><br><\/strong> Select First\u2011Class (up to 13 oz) if you only need postage. For full labels with addresses, select the class under \u201cPackages\u201d and mailpiece type \u201cLarge Envelope\/Flat.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-3-enter-delivery-and-return-addresses\"><strong>Step 3: Enter delivery and return addresses<\/strong><\/h3>\n\n\n\n<p><strong><br><\/strong> Provide the \u201cShip To\u201d and \u201cShip From\u201d addresses. Use your contacts or enter manually.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-4-enter-weight-and-select-service\"><strong>Step 4: Enter weight and select service<\/strong><\/h3>\n\n\n\n<p><strong><br><\/strong> Weigh your flat, then choose the appropriate USPS service and specify package type \u201cLarge Envelope\/Flat.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-5-print-postage-or-label\"><strong>Step 5: Print postage or label<\/strong><\/h3>\n\n\n\n<p><strong><br><\/strong> Click \u201cPrint Postage.\u201d You can print on plain paper, Stamps.com label formats (e.g. SDC\u20113110), or Avery labels (e.g. 32403). Tracking is available for Priority \/ Express flats.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-6-secure-your-flat\"><strong>Step 6: Secure your flat<\/strong><\/h3>\n\n\n\n<p><strong><br><\/strong> Ensure there are no bulges, protrusions over \u00bc inch, and that contents do not shift more than 2 inches inside. Otherwise, it may violate flat rules.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you need to send a manuscript, set of reports, or sheaf of bills, you&#8217;re going to need something a bit larger than a normal letter-sized envelope. The USPS recognizes a category of Flats which can comfortably house numerous sheets of paper, magazines, journals, books or other material, without needing to fold the items. The [&hellip;]<\/p>\n","protected":false},"author":90,"featured_media":247031,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[116],"tags":[104],"class_list":["post-247029","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mailing-essentials","tag-how-to-guides"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.1 (Yoast SEO v25.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How To Ship Flats With Stamps.com - Stamps.com<\/title>\n<meta name=\"description\" content=\"How To Ship Flats With Stamps.com If you need to send a manuscript, set of reports, or sheaf of bills, you&#039;re going to need something a bit larger than a normal letter-sized envelope. 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