(57) The envelope (10) comprises one or more pockets (11) for holding flat articles (12);
close to at least one side edge the pocket (11) comprises an intermediate welding
line (19, 19', 19'', 19''') provided with clamping means (20, 20', 20'') for frictionally
retaining an article (12), by stretching the pocket between side welds; guide means
(19, 19', 19'', 19''') in the form of a slanted welding are provided on at least one
side of the pocket (11) to guide the article (12) from the open side of the same pocket
towards the article clamping means (20, 20', 20'').
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