Abstract: A mailing package comprises a package body having a first section, a second section, and a third section, the first section connected to the second section by a first foldable joint;the second section is connected to a first end section through a second foldable joint and a second end section through a third foldable joint and having a plurality of end slits cut therethrough disposed near the end flaps, a first and second guide receiver slit, and a main locking flap receiver slit; andthe third section connected through a fourth foldable joint to the second section, and to a first locking end flap, a second locking end flap, and a main locking flap having a main locking tab and a first and second guide tab;the sections joined such that when the second flap is folded over the third flap the plurality of end slits are presented to the first and second locking end flaps, the first and second guide tabs are received in the first and second guide receiver slits and the main locking receiver slit is presented to the