I have used these envelopes for many years and they are very easy and quick to seal. The only negative is that the edges of the flaps do not seal and apparently they sometimes get caught and torn in the postal machines. I would also like to see window envelopes for invoices that have the pull & seal feature.
This envelope is not cheap. However do you want a paper jamb every 10th print or every 2000th print. Security envelopes jamb....period! If your not the secret service or the FBI then buy thinner envelopes...they print better. A great value.
Self-sealing envelopes are a great time saver. The strip on these envelopes does not pull off easily. Part of the time saving is lost as you slow down so that the strip does not rip. The previous Staples envelopes were better.