What is a Side Seam envelope and how does it differ from a Diagonal Seam envelope?

Updated 4 months ago by Alexis Underwood

Most invitation "A"-sized envelopes have side seams. Think A2, A7, etc
Most commercial sized envelopes have diagonal seams. Think #9 regular, #10 regular, etc.

What is the difference?

Side Seam:

The back of the envelope is put together with two vertical glue seams (as opposed to three triangular flaps) which give a more finished look to the envelope.

Diagonal Seam:

Fitting to their name, seams run diagonally across the back. The back of the envelope is put together as three triangular flaps.


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