The difference between glassine envelopes and regular envelopes is that the first ones are water and air resistant, that is why they have different uses, such as carrying pharmacy products or firecrackers.
The design is different for business envelopes depending on the need. The typical size is usually a ten though. There are different designs and uses for them.
Stationery: Pens, pencils, staples, staplers, paper, envelopes etc
Cellophane envelopes are commonly used in the food business. Cookies and other goods are normally packaged in them and distributed. They are also commonly used for gift bags at parties.
Clear envelopes are usually used to contain and protect documents of a sensitive nature. An example would be storing your birth certificate in a plastic envelope would help protect it from water damage.
Wax Seals were used many, many years ago on various items, including rings (worn by kings), envelopes and other objects. The wax seal is still being used today for envelopes.
There is no standard collective noun for 'envelopes', in which case a noun suitable for the situation can function as a collective noun; for example, a box of envelopes, a pack of envelopes, a stack of envelopes, etc.
Non-clear poly envelopes are often used for shipping documents and other materials in a fashionable, noticeable way. Clear poly envelops are seen in officers to carry documents where security is not as great of a concern.
Envelopes is correct.
Envelopes come in several shapes and sizes. I assume Hallmark envelopes can be printed in any printer designed and capable of printing envelopes.
there is NO antonym for envelopes due to the fact that it is a noun.
SIC 2677 applies to ENVELOPES.