Was a bad purchase; window unnecessary.
Do exactly what they are supposed to do
Good size/quantity
Too bad in the M there was only this format, the narrow windows were not available
Useless because there are no left window covertes
Even more than 20 years ago, these were the envelopes in my office. Definitely cheaper than those sold in stationery stores but with impeccable quality.
I was very annoyed that the 100 pack is no longer available!!!
Needed again and again
High quality
very good