◆ About the product ・Reusable envelope ・Set of 4 ・Made by sewing DTRS75 polyester ripstop with a sewing machine ・This fabric is used for outdoor goods and is durable and water-resistant. ・The back side is film-processed, and the fabric itself is waterproof, but it feels a little rough to the touch. Also, wrinkles will occur during the manufacturing process and use. ・Opens and closes with plastic snap buttons ・Size is 11.3/16.8cm. It's the perfect size for a folded A4 sheet of paper or a postcard. ・How about for a heartfelt love letter or invitation? ・Also for storing important postcards