Whether with or without a window, your GreenLine envelopes are available in various formats. The classic DIN-long format measures 110x220 mm. We also offer the common B6 size, which is suitable for A6 postcards or double-folded standard letterhead, as well as B5 for A5-sized documents or B4 for A4 letterhead. The A3+ envelope is available for even larger contents, measuring 329 x 470 mm.