The Staples brand envelopes, #10 size, 100 count box is a staple product that I always keep in the house.
I have to admit that I'm an office supply fanatic, I really love going to Staples and purchasing new office supplies. Kind of odd, but true.
This particular envelope is the #10 size, which means that the envelope is 4 1/8" x 9 1/2", so it's the perfect size to fold up a piece of computer paper into thirds and mail it.
This envelope also has a security tint, which means it has a blue patterned inside, so that even if someone held the envelope up to the light and tried to see what was inside, they couldn't. I think that's really important in this day and age.
Finally, I love the Pull and Seal feature. I absolutely detest licking envelopes and refuse to do it! With the Pull and Seal envelopes, you can just pull off the little piece of protective covering and it reveals sticky glue. No fuss, no mess.
This particular envelope also comes in a 500 count box, which probably costs less per envelope, but I prefer this size only because I don't want a large box of envelopes taking up space in my office.