CP 010.04 Rigid All Board Envelopes are ideal for A4 and slightly-over-A4 sized items like files, frames, artwork and electronic items. They have an external size of 250mm x 351mm and are pre-creased to allow you to easily select a depth of up to 35mm. At maximum capacity the internal measurements are 235mm x 340mm x 35mm*. Rigid All Board Envelopes are resistant to bending and feature reinforced corners and edges for extra protection against crumpling or creases. Made entirely from super-strong E-flute corrugated brown cardboard these envelopes are economical and effective, ensuring items arrive at their destination in perfect condition and reducing packing time and postage costs compared with using standard cardboard boxes. Each envelope includes a super high tack self-adhesive strip for quick and easy packing and sealing, and an easy-open tear strip to give customers fast access to their delivery. The cardboard used is even safety tested to eliminate the risk of paper cuts. *Effective size decreases with increasing thickness