220mm x 220mm Mailer Gummed White 100gsm Envelopes (Qty 500)These 220mm x 220mm Mailer Gummed White 100gsm Envelopes (Qty 500) are perfect for a wide range of mailing tasks. Made from 100gsm white paper, these envelopes offer a durable and professional option for sending documents, reports, or promotional materials. The square mailer design provides ample space, while the gummed flap ensures a secure seal to keep your contents safe during transit. With a clean, classic appearance, these envelopes are ideal for