50 Pack: Never worry about running out of essential mailing supplies again. Secure your documents and correspondence with our 50-pack of white envelopes, perfectly sized at 115mm x 225mm, providing ample and reliable supply for all your mailing needs. A4 Tri-Fold: Streamline your mailing process with our self-adhesive white office envelopes, specially designed to accommodate A4 paper folded into thirds. Adopt the traditional letter format for mailing, ensuring a perfect and professional fit for your important documents. Self-Seal: Improve the security of your mailed items with our envelopes featuring high-quality self-adhesive adhesive. Designed for convenience and reliability, this self-seal technology ensures a secure seal during transit, providing peace of mind for both the sender and recipient. Multi-purpose: Beyond mailing, these envelopes are versatile and multi-purpose, making them ideal for a variety of applications around the home, office, or school. Whether you're mailing