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Our great value Letter Size Envelopes are available in a range of handy envelope sizes with a choice of manilla or white, with or without windows. These economical envelopes are a versatile everyday option for posting out documents and letters. All of our high-quality letter size office envelopes have self-seal strips to provide a quick and easy strong seal. Available with great mix and match bulk deals on all products through our Accumulator Saver scheme and 1% back on all orders.