Why do you love letter writing? Is it the mindful nature to sit down and share your thoughts? Is it the cool envelope or the stamps? The selection of stationery to choose from? All of the above? Having the best gear is half the fun. Spruce up your stationery wardrobe with new airmail envelopes in two sizes: A6 and A4. These Japanese made envelopes are exquisitely made and come in packs of 10.