Made from high-grade solid board, these brown postal pocket envelopes have measurements of 310 x 445 x 30mm* and are ideal for sending magazines, documents and all other types of printed media. Featuring a peel and seal strip, our solid board envelopes offer a reliable and secure seal whilst the notched flap allows for easy resealing making them perfect for repeated use. Sporting bend resistant, reinforced edges these envelopes are perfect for keeping your documents safe. Manufactured from sustainably sourced, high grade solid board, these envelopes are recyclable, biodegradable, climate neutral and are FSC/PEFC certified.  *Effective size decreases with increasing thickness