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Your cart is empty.Columbian 9 x 12 SimplySafe Security Envelopes are ideal for mailing important documents or sending sensitive client information. Each security tinted envelope has a scrambled blue pattern printed on the interior that conceals the contents. The patented SimplySafe seal is constructed to show any signs of tampering. These mailing envelopes are still easy for the sender to close and the intended recipient to open. The Release & Seal strip peels right off so you can press to seal without any moisture. A pull strip makes opening the envelope straightforward and prevents you from tearing the documents inside. These self seal envelopes are inkjet printer compatible, though not recommended for a laser printer (use address labels instead). Stock up on 9" x 12" security envelopes for billing paperwork, tax documents, accounting records and more. Made from durable 28 lb paper. Overall envelope dimensions are 9 x 12 inches. White. Box of 100.
Kimberly Zittlow
2025-08-22 15:45:53
I can't say enough good things about the Columbian 9x12 Clasp Envelopes! As someone who frequently sends out important documents, promotional materials, and even bulky items for my business, having high-quality envelopes is an absolute must—and these deliver on every level.First off, the durability of these envelopes is unmatched. The heavyweight paper feels strong and sturdy in your hands, so I never worry about rips or tears in transit. Whether I'm stuffing them full with multiple pages or mailing something heavier like catalogs, they hold up perfectly. The reinforced seams are an added bonus, giving me peace of mind that my items will arrive intact.The self-sealing closure is a game-changer. The adhesive strip is incredibly sticky and provides a secure seal without the hassle of using tape or glue. It makes mailing large quantities so much faster and more efficient. I also appreciate the reusable clasp feature for times when I need to send something that may require reopening—like contracts for signature or reusable mailing supplies.Another standout feature is the clean, professional look of these envelopes. The bright white color and smooth finish make them ideal for business correspondence. I feel confident using these for important mailings to clients because they look polished and convey a sense of quality.What truly sets these apart for me is their versatility. I use them for everything—from mailing reports and brochures to organizing paperwork in my home office. I've even used them to store loose documents when traveling, and they hold up wonderfully without getting bent or crumpled. Plus, with a box of 100, they last a long time and are great value for the price.One example of their reliability: I mailed a set of delicate photographs to a friend across the country. I was a bit nervous since photos can be easily damaged in transit, but these envelopes protected them perfectly. When my friend received them, everything was in pristine condition, and she even commented on how secure the envelope felt!If you're looking for high-quality envelopes that can handle everything from everyday use to heavy-duty mailing, these are it. They’re not just functional—they’re dependable, professional, and well worth every penny. Highly recommended for both personal and professional use!
CPGab
2025-08-20 18:39:25
They do exactly what I need them to do. I like the pre-stick closure and the easy-open strip. Good quality and thickness. Good value for the cost and fits as much as any 9x12 envelope would hold.
Joe-Sam
2025-08-03 13:39:40
Great quality, good value, lightweight would buy again
Darla T
2025-07-19 13:45:33
I really like these envelopes and they were a great deal. I love the fact that they have a seal that will let you know if they were tampered with. My one issue is that the seal doesn't stick very well, but a little tape or glue takes care of that. I definitely recommend these envelopes.
Gary M.
2025-06-30 15:31:34
Delivered on time in fine condition. Nice product.
Tony D
2025-04-21 14:07:12
I do purchase a lot of office supplies from Amazon for convenience, price and quality. These are great and the adhesive is fresh, sticks well and not fry like past big store experiences
Happy lady
2025-02-28 14:06:40
This envelops are great for security and self seal. I use them to organize all my receipts for tax time!
Marlette L.
2025-01-12 11:27:43
I use these for holding pattern pieces after I’ve used the pattern. It helps avoid having to fold them so many times. I have a large wire basket holding them in my closet
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