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Some of the different ways of sealing
With a range of different uses, picking the right way of sealing is an equally important factor for speed, convenience and longevity.

Gummed

With either a single or double strip of adhesive, sealing a gummed envelope requires application of moisture to the gummed strip before being closed. The ways of applying the moisture may be automatic (e.g. mailing machines), sponges or just a good, old fashioned, lick. With a long shelf life, they can be useful for occasional use envelopes but if you're planning on manually sending reasonable volumes on a regular basis, consider other options as licking 100's of envelopes is never a pleasant experience!

Self Seal

With self-adhesive latex strips on the flap and the back of the envelope, self-seal envelopes simply need to be pressed together to ensure a strong seal. However, with a shelf-life that will vary depending on storage conditions, if you are only sending occasional mailers but would like to take advantage of the bulk discounts available, longer-life options such as Peel & Seal may be preferable to prevent any instances of the effectiveness of the self-seal reducing which is usually characterised by a browning of the latex strip.
Peel & Seal

Manufactured with a strong adhesive covered with a protective strip, Peel & Seal envelopes simply require the protective strip to be removed (Peeled) and then the flap pressed down to create a strong bond. With a long life and strong sealing method, we recommend Peel & Seal closures for premium weight and style envelopes with the majority of our 120gsm+ ranges available with this closure. Equally, the strength of the seal lends itself well to our range of gusseted (high capacity) envelopes plus all-board and board-back ranges where quality and strength matter.
Others

Whilst the above 3 styles are most common in office and mailing applications, there are further options such as disk and string or even ungummed for internal use envelopes or anywhere that doesn't require the envelope to be sent via a 3rd party. Even resealable envelopes are available as a convenient means of reusing internal envelopes.