Carbon Neutral

Types of Envelopes

The Spanish norm defines the envelope as "a flat, rectangular-shaped wrapper, generally obtained from a sheet of paper folded in such a way that a single front side is obtained and a back side formed by four flaps which are mounted together. In general, three of these flaps (sometimes only two) are stuck to each other and the fourth one, which may or may not have adhesive, which serves as the seal. This fourth flap may be situated on the longer side (envelope) or on the shorter side (pocket) of the rectangle. The front side may have a transparent window.".

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A first distinction: envelope, pockets, wallet

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Envelopes

The shape and size of the flaps define the different envelopes:

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Pockets

Various combinations of folding, paper, plastic and windows give rise to different wallets for special uses.

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Photographic wallets

The way of constructing and folding the envelope makes the difference between a wallet and a pocket.

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