News – Tagged "Large Letter Boxes" – Pack Solution

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Slim brown large letter postal boxes in four sizes, one open with a greeting card lying flat inside

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Large Letter Boxes Explained: What Fits, Sizes and How to Stay Within Royal Mail Limits

16 Oct 2026 Pack Solution

How Royal Mail's Large Letter format works, which items fit a 20mm PIP box, how to choose between Mini, C6, DL, C5 and C4 sizes, and the checks that stop a parcel being charged at a higher rate.

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