1 of each size. 5 packs total still sealed in plastic. 25pk 10.5×16 50pk 5×8.6 25pk 8.5×12 100pk 6×10 100pk 4×8 The UCGOU Blue Bubble Mailers in various sizes are a convenient and reliable option for shipping and mailing needs. With the trusted Ucgou brand, these mailers offer protection and security for your items. The blue bubble design adds a touch of professionalism to your packages, making them stand out in the mail. Whether you need to send small letters or large packages, these mailers provide a consistent and high-quality solution for your business or personal needs.