Security Envelopes Letter Size, #10 Envelopes Self Seal, 100 | One hundred per box. Peel the Redi-Strip and press - no moisture, no licking; security tint, 24 lb, no window.

I usually don't spend so much money on stationary, but these came highly recommended to me and I really enjoy using them. They not only have a sturdy feel to them, but they are also very convenient as they are very easy to seal with the provided adhesive on each envelope. They fit standard letters and then some well so you can store as much as you need for regular First-Class postage. I like the fact that you can purchase them in bulk here too. Might need to invest in some for pen paling and general mail use. Great product!

After pricing similar #10 envelopes at my two local office supply stores I discovered that Amazon offered a lower price and FREE home delivery through my Prime account for this 500 envelope box. These envelopes were accurately represented on Amazon's Web page. They feed through my laser printer from its multi-purpose tray without jamming, revealing clear address images including my imprinted bar code. After having to throw away a large quantity of envelopes that had sealed themselves when they were stored in a high-humidity location, I like that these envelopes do not need moisture to seal and have the adhesive protected with a removable waxy strip that prevents self-sealing. Not having these envelopes long enough to detect any possible deterioration during long-term storage, I cannot evaluate how well they hold up. However they appear to be well-made and seal effortlessly once the waxy strip is removed from the adhesive on the envelope's flap. If the envelope is held up to a bright enough light, the so-called "Security Tint and Pattern" is not opaque enough to completely hide the envelope's contents. If completely hiding the contents of your mail is a major concern, a heavier weight envelope might be a better choice, but these work great for me. In summary, these are good, all-purpose #10 envelopes sold at a competitive price and delivered FREE for Amazon Prime members.

Very nice quality paper with self seal envelope. Definitely will buy again.

Perfect, price is right.

First and foremost, the material is of excellent quality. The paper is sturdy and feels durable, ensuring that the contents inside are well-protected. The adhesive strip works perfectly, providing a secure seal every time without the need for extra tape. The size of the envelopes was just what I needed, fitting my documents snugly without any hassle. I appreciate the value for money. The pack came with 100 envelopes at a very reasonable price, making it a cost-effective choice for anyone in need of reliable mailing supplies.

What Makes These Professional Grade: Security Tint Actually Provides Real Privacy: The interior tint pattern is dark enough that you genuinely cannot read contents through the envelope, even when held up to light. I tested this with invoices containing financial information - completely private. This matters when mailing sensitive business documents or personal checks. 24 lb Weight Feels Substantial: These are noticeably heavier and more professional than standard 20 lb envelopes. They don't feel flimsy or cheap when clients receive them. The weight conveys quality and professionalism immediately. Redi-Strip Self-Seal is a Time-Saver: Peel the strip, press to seal - takes 2 seconds per envelope. After sealing 85 envelopes over five months, I've saved significant time compared to licking or moistening traditional gum seals. The adhesive is strong and secure. No Window Design is More Professional: For my business needs, windowless envelopes look cleaner and more formal. I print labels or hand-address them, which adds a personal touch clients appreciate. Window envelopes feel more corporate and impersonal. White Wove Finish Looks Premium: The slight texture (wove finish) gives these envelopes a higher-end appearance compared to smooth standard envelopes. They photograph well and look professional when stacked on a desk. Standard #10 Size Fits Everything: 4-1/8" × 9-1/2" is the perfect business size. Fits standard 8.5" × 11" paper folded in thirds, checks, invoices, letters - everything business-related. Adhesive Holds Strong: Not one single envelope has come unsealed in transit. The Redi-Strip adhesive creates a secure, permanent bond. I've had zero complaints from clients about opened or damaged envelopes. Clean, Sharp Edges: No ragged cuts or uneven edges. These are precisely manufactured with crisp corners and clean folds. Details matter when presenting professional correspondence. Consistent Quality Throughout Box: All 100 envelopes have been identical in weight, color, and construction. No defects, no variations, no duds. Works with Laser and Inkjet Printers: I've printed addresses directly on these envelopes using both my HP LaserJet and Canon inkjet. Both print clearly without smearing or jamming. Easy to Write On: Ballpoint pens, gel pens, and felt-tip markers all write smoothly on the wove finish. No ink bleeding or feathering when hand-addressing. THE CONS - Setting Realistic Expectations: Price is Higher Than Basic Envelopes: At roughly $12-16 for 100 envelopes (prices fluctuate), that's about $0.12-0.16 per envelope. Basic envelopes cost $0.05-0.08 each. You're paying a premium for security tint and quality. No Window Means More Work: If you're mailing high volumes where window envelopes save time, the no-window design requires printing/writing addresses on every envelope. For me (15-20 per month), this isn't an issue. 24 lb Weight Means Slightly Higher Postage: Heavier envelopes can push you over the 1-ounce threshold faster if you're including multiple pages. I haven't had issues with standard 2-3 page letters, but be aware if mailing thick documents. Security Tint Uses More Ink/Resources: The printed interior pattern means more manufacturing resources. If you're extremely eco-conscious, plain envelopes use less ink. Self-Seal Strip Can Stick Prematurely: If you accidentally touch the adhesive before you're ready to seal, it's difficult to reposition. Handle carefully until ready to seal. Limited Color Options: Only available in white. If you need colored envelopes for branding or visual coding, look elsewhere. Box Packaging is Basic: They come in a simple cardboard box. No fancy storage or dispensing system. You'll need to provide your own organization if that matters to you. Not Moisture-Resistant: If envelopes get wet, the paper will absorb water and potentially damage contents. Not designed for outdoor mail slots in rainy climates. REAL-WORLD USAGE OVER 5 MONTHS: Monthly Volume: Approximately 15-20 envelopes per month for invoices, contracts, thank-you notes, and business correspondence. Total Used: 85 of 100 envelopes in 5 months Sealing Success Rate: 100% - zero envelopes failed to seal or came open Client Feedback: Three clients specifically commented that my correspondence "looks professional" - attributing this partially to envelope quality Printer Compatibility Test: HP LaserJet Pro M404n: Perfect, no jams, clean printing Canon PIXMA TS6420: Works well, no smearing Hand-addressed: 70 envelopes hand-addressed with no issues Security Testing: Held envelopes with sensitive financial information up to bright light and sunlight - contents completely unreadable through security tint. Durability in Mail: Not a single client has reported damaged or opened envelopes. USPS handling hasn't caused any tears or damage. Time Savings: Approximately 30 seconds per envelope saved compared to moistening traditional gum seals. Over 85 envelopes = 42 minutes saved. COMPARISON TO ALTERNATIVES: vs. Standard 20 lb Envelopes: Quality Park feels significantly more substantial. Worth the upgrade for professional correspondence. vs. Window Envelopes: Window envelopes save addressing time but look less personal. Trade-off depends on your volume and priorities. vs. Security Envelopes with Windows: Those exist but I prefer the clean, professional look of no windows for my business. vs. Cheaper Amazon Basics Envelopes: Haven't tested directly, but reviews suggest Quality Park has better consistency and adhesive quality. vs. Premium Crane & Co. Envelopes: Crane is higher-end ($0.50-1.00+ per envelope) but overkill for business invoices. Quality Park hits the sweet spot. IDEAL USE CASES: Small Business Invoicing: Professional appearance for billing clients Contract Mailing: Security tint protects sensitive agreement details Check Mailing: Security feature essential for financial documents Personal Financial Correspondence: Tax documents, bank information, confidential letters Professional Thank-You Notes: Elevated appearance for client appreciation Legal Correspondence: Attorney letters, legal notices, confidential communications Medical Billing: HIPAA-compliant privacy for patient information Nonprofit Fundraising: Professional appearance for donation requests and acknowledgments NOT IDEAL FOR: High-Volume Mail Houses: Window envelopes are more efficient for massive volume Marketing/Promotional Mail: Plain security envelopes don't grab attention like branded colored envelopes Casual Personal Correspondence: Overkill for birthday cards or casual letters Extremely Budget-Conscious Mailings: Basic envelopes cost half as much if security isn't needed Wedding Invitations: Too business-like for formal social events PRO TIPS FOR BUSINESS USE: Buy in bulk when on sale - I've seen these fluctuate $4-5 in price; stock up during deals Print return address - Looks more professional than handwriting for business Use quality labels or direct print - Don't cheap out on addressing after investing in quality envelopes Store flat in dry location - Prevents curling and keeps them pristine Handle adhesive strip carefully - Don't touch it until ready to seal Align printer carefully - Test print on scrap envelope first to ensure proper address positioning Keep a backup box - Running out mid-billing cycle is frustrating Use for important mail only - Reserve these for professional/confidential correspondence; use cheaper envelopes for casual mail COST-BENEFIT ANALYSIS: Cost per envelope: $0.12-0.16 Professional impression value: Clients notice quality Time saved per envelope: 30 seconds vs. traditional sealing Security value: Peace of mind for sensitive documents Total cost for 20 envelopes/month: $2.40-3.20 per month Annual business cost: $28-38 per year for professional correspondence For the professional image and time savings, this is excellent ROI for small businesses. UNEXPECTED BENEFITS: Clients Comment Positively: Multiple clients have mentioned professional appearance, which reflects well on my business Reduced Anxiety: Security tint provides peace of mind when mailing checks or financial information Faster Billing Cycle: Self-seal feature speeds up invoice mailing, improving cash flow timing Professional Consistency: Using quality envelopes for all business correspondence creates brand consistency No More Envelope Licking: Sounds minor, but avoiding saliva-sealing envelopes is more hygienic and dignified QUALITY DETAILS THAT MATTER: Seams are well-constructed: No weak points or separation Corners are reinforced: Don't tear easily during opening Tint pattern is consistent: Every envelope has uniform security coverage Color is true white: Not cream, not bright white - professional neutral white Adhesive doesn't yellow: No discoloration over time Folds are crisp: Sharp, clean fold lines when sealing OVERALL VERDICT: These Quality Park envelopes are exactly what professional business correspondence deserves - quality construction, security features, and presentation that conveys competence and attention to detail. After five months and 85 envelopes, I have zero complaints. They've performed flawlessly in every scenario: printer compatibility, sealing strength, security protection, and professional appearance. The fact that I've already reordered before finishing my first box should tell you everything. Are they more expensive than basic envelopes? Yes. Are they worth it for professional business use? Absolutely. The combination of security tint, 24 lb weight, self-seal convenience, and professional appearance justifies the premium for anyone mailing important business documents. WHO SHOULD BUY THESE: Small business owners mailing invoices/contracts Freelancers and consultants Anyone mailing checks or financial documents Professionals wanting to convey quality People handling confidential correspondence Nonprofits doing professional fundraising Medical/legal offices needing privacy Anyone tired of licking envelopes WHO MIGHT WANT ALTERNATIVES: High-volume mailers (window envelopes more efficient) Extremely budget-constrained operations Casual personal correspondence (overkill) Marketing mail needing eye-catching designs Anyone needing colored envelopes BOTTOM LINE: Five months ago, I upgraded from cheap envelopes to these Quality Park security envelopes. The difference in professional appearance and client perception has been noticeable and worthwhile. Small details matter in business, and envelope quality is one of those details. I'm 85 envelopes in with 15 remaining, and I've already ordered my next box. That's the highest endorsement I can give business supplies - when you proactively reorder before running out because you don't want to risk being without them.

I prefer self seal envelopes. The weight and security pattern are good. I don't do a lot of mailing, so the 40 pack is ideal.

Product works as expected. Good quality and good value for the money.

Excelente producto

Really nice envelopes at a really reasonable price. The paper is not cheap and the privacy of contents is maintained. Envelopes seal well. Very happy with purchase.

Quality is good. But I think I have paid 5-6 times the going prices.

Todo bien

I was not sure what these would be like but I'm pleasantly surprised. The adhesive sticks, the privacy is what I wanted and they feel very professional. A better envelope than I usually buy (Mead) and cheaper too!