Now that you’re back at work, it’s time for you to deal with more mundane matters such as dealing with #9 vs #10 envelope options.
Keep in mind, however, that when you’re contemplating #9 vs #10 envelope choices, you don’t have to pick one over the other each time.
In fact, they’re often used together.
This post, it’s photos and table include links to products on other websites. If you purchase something through these links we may earn a commission at no extra cost to you.
Envelope Size Guide
Here’s a handy size guide to show you the dimensions of the more common envelope sizes you’ll use for work (and for some personal correspondence):
A-Envelopes
- A1 Envelope – 3⅝ by 5⅛ inches
- A2 Envelope – 4⅜ by 5¾ inches
- A6 Envelope – 4¾ by 6½ inches
- A7 Envelope – 5¼ by 7¼ inches
- A8 Envelope – 5½ by 8 ⅛ inches
- A9 Envelope – 5¾ by 8¾ inches
- A10 Envelope – 6 by 9½ inches
Small Envelopes
- #6½ – 3½ by 6¼ inches
- #6¾ – 3⅝ by 6½ inches
- #7 ¾ – 3⅞ by 7½ inches
Standard Envelopes
- #8⅝ – 3⅝by8⅝ inches
- #9 – 3⅞ by 8⅞ inches
- #10 – 4⅛ by 9½ inches
Oversized Envelopes
- #11 – 4½ by 10⅜ inches
- #12 – 4¾ by 11 inches
- #14 – 5 by 11½ inches
You may want to post an envelope size chart on your wall if you’re often sending out various types of letters and catalogs to your customers.
That way, you can pick among the#9 vs #10 envelope options more quickly.
#9 vs #10 Envelope: Key Features
The number 10, as you can see, is different from the A10 envelopes.
The dimensions of the #10 envelope are ideal for a standard 8½ by 11 paper that’s been folded in thirds.
The #9 vs #10 envelope options also often go together because number 9 envelopefits inside the #10.
The #10 is basically the standard business letterhead envelope, while the number 9 envelope is the standard reply envelope.
Since your recipient gets the reply envelope, they’re more encouraged to send in the reply in the first place.
Factors to Consider
It’s not enough to just pick any set of #10 and #9 envelopes to send to your customers and friends.
They’re not all the same, as some are better than others.
Or more accurately, some envelopes may suit your needs and preferences better.
Strength
Going with 24-pound paper is often good enough.
You may even want a Tyvek envelope, if you want something tear-resistant.
But this envelopes feature may be overkill for most companies.
Size
While you have the standard envelope sizes, you may want some other common envelope size for thicker materials and extra letters.
You also have to make sure that your letters, invoices, and checks fit in snugly.
You may want to go with a square envelope with square flaps.
Or maybe you need a booklet envelope.
Windows
Do you want your envelope to have a transparent window to see part of the contents inside?
Windowed envelopes let people see a bit of what’s inside.
With single windows, you can just print the recipient address on the paper inside and it will show through the window.
The double window design can also show the return address as well.
Of course, you can opt for a business envelope that doesn’t have any windows at all.
Security Tint
It’s very possible for some people to peer through a thin envelope to see what’s inside.
But if privacy is an issue, then you may go with an envelope with a security tint.
This tint prevents this kind of snooping.
Sealing
It should be easy to seal the envelope to make things easier for you.
At the same time, it should offer a secure seal so that it won’t open easily.
Printer Compatibility
If you prefer to print the recipient address on the envelope itself, the envelope paper should be compatible with the type of printer you use.
Number of Envelopes per Pack
This is simply a matter of convenience.
Get more envelopes per pack if your business tends to deal with a lot of correspondence.
Of course, if you’re just using the envelopes for a few dozen party invitations, a pack of 500 envelopes won’t really be sensible.
Price
If your business involves massive levels of correspondence, the cost of the envelopes will be a factor.
One envelope may cost a few cents more than another, and that may not be a big deal.
But when you’re using thousands of envelopes, the costs may become substantial.
It’s not really the most important factor, however.
But if you have 2 brands of envelopes with exactly the same features, go with the cheaper brand.
Color
If you want envelopes for business correspondence, you ought to stick with the standard white envelope.
Anything else just doesn’t look and feel as professional.
However, you can still go with envelopes of different colors if you wish to be more memorable.
It will probably cost you more, though.
Also, it doesn’t look as professional, so it may not be suitable for invoices and other similar documents.
But colored envelopes may be appropriate for party invitations and other similar types of correspondence.
Product Reviews: #9 vs #10 Envelope
Check out some of the excellent options for your direct mail.
1. Aimoh #10 Security Tinted Self-Seal Envelopes
“Great for Secure Mailing”
Our Rating: 5.0
There’s no window here, and that’s not surprising.
That’s to emphasize that this envelope is meant to offer topnotch security to preserve privacy.
This comes with the full complement of security features that come from the brand’s EnveGuard Technology.
You also get 100 envelopes per pack, which should be enough to last awhile for lots of businesses.
Security Tint Pattern
Even if you try to peer through the envelope against a bright light, you won’t have a real idea of what’s inside.
That’s because it has a professional-grade security tint pattern to obscure any print or image inside.
This is the security feature that makes the envelope ideal for secure mailing.
Pre-Gummed Quick Seal Strip
This is a self-seal adhesive strip that offers you a very secure seal across the entire width of the envelope.
This will not open or tear very easily, so curious folks can’t just surreptitiously open the envelope this way.
You can still reopen the envelope right after sealing it, but you’ll need a bit of effort for this.
This is helpful, if you suddenly realize that you’ve forgotten to put some important document inside, but after a day, this won’t open easily.
If you do open it and then reseal it, it will be obvious that it’s been previously opened.
The seal is secure enough that it won’t open on its own in transit on the way to the recipient.
Strong and Large
This envelope measures 4⅛ inches by 9½ inches, which offers ample space.
It also uses 24-lb. paper, which is nice and thick.
This is thick enough that it’s not too transparent.
You can put in your number 9 envelope inside, along with several business stationery documents if you want.
The tough construction just won’t tear easily.
Printer-Compatible
Without a window, you may worry that you’ll have trouble printing the recipient address and the return address on the envelope.
On other #9 vs #10 envelope options, you may have to use stickers on the envelope.
That’s a rather tiresome option, however.
The good news is that this is compatible with most models of laser and inkjet printers.
That should let you print the addresses on these envelopes with no trouble.
2. AmazonBasics #9 Double Window Security Envelopes
“Envelope for QuickBooks”
Our Rating: 4.5
If you want secure envelopes and two windows, then this is what you ought to get.
You can go with 500 envelopes at once, so you won’t have to keep buying them.
You also have a nice, convenient box that contains these envelopes.
Just pop open the box, take out the envelopes you need, and then close the box again to protect the envelopes.
3⅞ by 8⅞ inches
Each one is a number 9 envelope, and it measures 3⅞ by 8⅞ inches.
That’s a size that fits in standard statements and invoices, since those are sized at 8½ by 11 inches.
Just fold these documents in 3 equal parts, and you’re good to go.
If you’re using these envelopes for your QuickBooks invoices, you’ll find them a perfect match.
Double Window
You’ll then find 2 windows arrange one on top of the other, on the left side.
The top window sits 2 inches from the bottom of the envelope, and you can use this to show your company info.
This top window measures 1 3/16 inches high and 3½ inches wide.
Then the other window is half an inch from the bottom, and here you can set the recipient address.
This bottom window measures 1 by 4 inches.
Consistent Placement
These windows are consistent in their placement.
It’s 2 inches from the bottom for the top window, and half an inch from the bottom for the other window below.
You can then print the info on the same place in your documents and they’ll show nicely each time.
Tinting
The windows only show what you want to show.
Other curious people can’t peer through the envelope to get a clue on what’s inside.
You have the standard security tint feature here that prevents unscrupulous folks from using that well-known trick.
Not Self-Sealing
To seal this envelope, you have to moisten the flap and then press the seal properly.
For some people, this is a disadvantage.
But there are those who actually prefer this traditional type of sealing over the self-sealing feature.
This is because the seal is extremely stable.
It won’t fail you during transport and it won’t open accidentally.
Safe Glue
You can even lick the envelope, which may not be fun in this brave new COVID world.
But it’s actually safe, despite that notorious Seinfeld episode which had George’s fiancée sealing the envelopes by licking them all.
In that episode, she developed fatal poisoning, but that won’t happen in real life.
That’s because envelope glue is perfectly safe, and the US FDA checks the glue even for envelopes made in countries like China.
But you can always use moistening products like most people.
3. AmazonBasics #10 Business Envelopes with Gummed Seal, White, 500-Pack – AMZP4
“For Personal or Business Letters”
Our Rating: 4.5
Now if you’re looking for a #10 business envelope instead of a number 9 envelope, AmazonBasics has you covered.
This is extremely affordable, as each pack costs about half of the price of the number 9 envelope we mentioned earlier on this list.
You also get 500 envelopes at once, so that you won’t have to keep buying these envelopes too frequently.
If you’re business deals with bulk mailings or you tend to mail stuff frequently to friends, then you can use this.
4⅛ by 9½ InchesThese envelopes measure 4⅛ by 9½ inches.
That’s big enough for standard business sheets (8½ by 11 inches) and other paper sizes.
24-lb Paper
It’s also in a nice white color, like any business envelope should be.
It uses 24-pound white wove paper, and this is tough enough to withstand the usual rigors of going through the mail delivery system.
You have a smooth and plain front for the envelope, and you have lots of space for both the recipient address and return address.
We’ve tried this with our HP printer, and we have no problems printing the addresses on the front side.
It shows nice and clear.
Gummed Seal
You can use a damp sponge on the edge of these flap envelopes to seal it.
Or you can even just lick the gummed strip.
It’s actually safe to do that, even in these pandemic times.
The moisture activates the glue so you get a strong and reliable seal for your envelope.
No Security Tint
The paper is opaque enough that it’s not easy to see what’s inside.
However, keep in mind that there’s no security tint here.
But then again, why pay for security tinting if you’re not really sending materials that require security or privacy?
If you’re just sending in regular letters to friends, or maybe some inoffensive catalog or pamphlet for customers, then this works well enough.
4. Blue Summit Supplies 500 No. 9 Flip and Seal Double Window Security Envelopes
“Secure QuickBooks Invoice Envelopes”
Our Rating: 4.5
We again have another pack with 500 envelopes.
Buying this many envelopes at once makes a lot of sense, especially for a business.
This is especially true for this particular type of envelope, since it’s designed for your QuickBooks invoices and business statements.
Envelope Size and Appearance
The whole envelope is 3⅞ inches high and 8⅞ inches wide.
That’s the ideal size for your QuickBooks invoices.
Just keep in mind that this won’t work for checks.
For checks, you have other size and design options in the whole #9 vs #10 envelopefield.
It comes in a professional-looking white color, with a serious feel brought by the 24-pound white wove paper for the envelope.
Top Window
The top window measures 1 3/16 inches high and 3.5 inches wide.
Its left edge is set ⅜ of an inch from the side of the envelope.
It’s ideal for your company name and return address, with ample height for your business logo.
Bottom Window
Then you have the other window sitting half an inch below the top window.
It’s also set ⅜ of an inch from the side of the envelope, so it’s aligned with the top window.
This time, it’s an inch high and 4 inches wide.
This is for the recipient address.
It’s half an inch from the bottom edge of the envelope.
Dark Security Tint
The addresses through the windows will be the only thing showing through here.
That’s because of the dark security tint design crisscrossing through the envelope.
Flip and Seal
The self-sealing design for the flap here will save you a lot of time and trouble.
You don’t have to moisten it, so no licking needed.
You don’t need glue sticks or tape either, as the seal will stay sealed.
After you’ve sealed it, there’s no bit of adhesive still exposed.
So, it won’t stick to other mail while in transit.
5. Next Day Labels #9 Ready-Seal Double Window Security Tinted Check Envelopes
“Envelope for Business Checks”
Our Rating: 5.0
What if you’re sending in a check?
Then this would be a good choice from the many #9 vs #10 envelope options available.
You have 500 of these double window envelopes per pack, so you have plenty to work with.
Usage
Use this option among all the #9 vs #10 envelope choices when you’re using QuickBooks checks and the Sage 100 program.
It also works with the Blackbaud software, or even Intuit.
It’s basically for all the standard business checks.
It works well when you’re using some sort of machine insertion for your checks.
Measurements
This comes with measurements of 3⅝ by 8¾ inches.
Then you have 2 windows, which may seem misaligned.
The top window is ⅜ of an inch from the left edge.
The bottom window is ⅞ of an inch from the left edge, and also ⅞ of an inch from the top window.
The arrangement ensures so that the addresses in the checks line up properly with these windows.
You also still have some bit of room so you can include letter size papers as well.
Stop Licking Envelopes
These envelopes don’t need moisture at all.
You just have to fold the flap and you get a good, secure seal.
This security also has the security tint inside.
Conclusion on the Best #9 vs #10 Envelope
Picking from the #9 vs #10 envelope options doesn’t seem to be important (or cool).
But these envelopes can make work go more efficiently, and save you a lot of trouble in the process. Pick among the #9 vs #10 envelope choices properly, and you can send invoices, checks, and brochures with the proper level of security you want.
Leave a Reply