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These custom-sized CP 015 Rigid All Board envelopes measure 260 x 150mm when flat and are pre-creased for a variable capacity of up to 50mm. When fully expanded to its maximum capacity of 50mm, the internal dimensions of these envelopes are 260mm x 150mm x 50mm*, making them perfectly suited for sending a wide range of items, such as books and electronics. Crafted from durable brown E-flute corrugated card, our Rigid All Board Envelopes ensure exceptional protection for your items throughout the shipping process. Engineered to withstand bending and fortified to preserve the sharpness of edges and corners, these envelopes assure the impeccable condition of your goods upon delivery. Equipped with a reliable permanent self-adhesive strip, they create a secure seal that deters tampering, while a convenient tear strip enables effortless access to the contents for your valued customers. *Effective size decreases with increasing content thickness