The largest in the Rigid All Board Envelopes range CP 010.10 are made in robust E-flute corrugated card in a standard brown finish. The external measurements are 540mm x 730mm and these versatile envelopes have an adjustable capacity with pre-creased folds up to a maximum of 50mm depth so it’s really easy to adjust the depth to give a closer fit for better protection. Suitable for use in sending larger items including precious photos, prints, vintage posters, canvases and artwork that cannot be rolled up in a postal tube, these envelopes have a maximum internal measurement of 530mm x 720mm x 50mm* and keep contents flat and protected to reach their destination in perfect condition. Send professional looking packages that are quick to pack with integrated self-adhesive strips for a secure closure. Rigid All Board Envelopes also feature a tear open strip to make them easy for customers to unpack. *Effective size decreases with increasing thickness