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Updated June 2026. What is the Celco Letter Sorter? The Celco Letter Sorter is a six-compartment plastic desktop organiser for sorting mail, papers and folders. Each compartment holds standard-size envelopes, sheets of paper and folders upright, so incoming and outgoing items stay separated and easy to find. It suits anyone who needs to keep a desk or counter tidy, from office administrators to teachers and ward clerks. Why a letter sorter matters Paper still piles up wherever people work. A le …