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Perfect Packaging - Premium White Postal Boxes - Internal Dimensions 280 x 280 x 40 mm, External Dimensions 300 x 285 x 45 mm, Pack of 50 Premium white postal boxes. Easy to fold with tuck in flaps (no tape required) Interior dimensions: 280 x 280 x 40 mm Exterior dimensions: 300 x 285 x 45 mm Made from white Kraft cardboard and clay coated on exterior side 100% Recyclable Perfect Packaging - Premium White Postal Boxes - Internal Dimensions 280 x 280 x 40 mm, External Dimensions 300 x 285 x 45 mm, Pack of 50