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These custom-sized CP 010 Rigid All Board envelopes measure 146 x 355mm when flat and are pre-creased for a variable capacity of up to 23mm. At maximum capacity of 23mm, the internal dimensions are 146mm x 355mm x 23mm*, the ideal size for sending longer thin items. Our Rigid All Board Envelopes are crafted from sturdy brown E-flute corrugated card, providing excellent safeguarding for your items during shipping. Designed to resist bending and reinforced to maintain the sharpness of edges and corners, these envelopes guarantee the pristine condition of your goods upon arrival. With a secure permanent self-adhesive strip, they create a tamper-proof seal, and a convenient tear strip ensures effortless access to the contents for your customers. *Effective size decreases with increasing content thickness