Product Details

Product Details

Mail smarter with Envelopes’ #10 Square Flap Envelopes (4 1/8 x 9 1/2), designed to combine everyday functionality with a refined, contemporary feel. Made from sturdy 24lb white paper and enhanced with a peel & seal closure, these envelopes offer reliable protection and an easy sealing solution—no licking required. A security tint lines the inside to protect sensitive contents, while the square flap delivers a polished edge that helps your mail stand out. Whether you’re managing office mailings or sending personal notes, these envelopes deliver quality, convenience, and a little extra sophistication in every send.

  • Height: 4.125 inches
  • Width: 9.5 inches
  • Finish: Smooth
  • Material: Paper
  • Paper weight: 24
  • Closure: Peel & Seal
  • Flap: Straight Flap
  • Envelope size: #10 - 4 1/8 x 9 1/2
  • Envelope seam: Side
  • Security tint: Blue
  • Envelope opening: Booklet
Turnaround Time

Processing time 

  • Standard Plain Processing Time

    1 - 2 Days

  • Custom Print Order Processing

    5 - 7 Days

Shipping/transit time is based on the shipping method selected at checkout and begins once the order has completed processing and ships. Visit our shipping policy page for more information.

Return Policy

Returns, exchanges or refunds are accepted when received back within 30 days of purchase. 

Please note that custom-made products are uniquely tailored to your specifications, and as such, we are unable to accept returns for these items.

Visit our Returns page for more information on how initiate a return.

Customize Your Order

Whether you want to promote your brand or personalize an invitation, custom printing is available for most products.

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FAQs

Where can I learn about custom orders and sample availability?

For custom orders, please fill out our free quote request form.

View our Samples FAQ

How can I better understand stationery sizes and types?

To help navigate your stationery options (and our recommendations), check out our comprehensive guides on paper weights and envelope sizes, including free, downloadable templates compatible with Microsoft Word.

Visit the Size Guide

How can I reorder items?

Reordering is a breeze! Simply sign in to your account and click the "Reorder" button.

Can I change or cancel my order?

If you are looking to change or cancel your order before processing, please reach out to us and we would be happy to help you.

Once your order has been processed for shipping—or has already shipped—it cannot be canceled. You may refuse the delivery, and the order will be subject to our return policy.

Reseller program payment authorization help

If there’s a reseller program credit card authorization issue, your order will be placed on hold, and our team will contact you immediately to resolve the problem so your envelopes can ship as quickly
as possible.