Abstract: According to the present invention, there is provided a weight apparatus, that includes a body. A first cavity is defined within the body such that it extends to an open end. A cap is configured to engage the body at the open end of the first cavity such that the first cavity is closed. A master latch configured to be retained by the cap. The cap is configured to rotate between an open first position and a closed second position. In the open first position, the cap can be separated from the body such that the first cavity is accessible and in the closed second position the cap cannot be separated from the body. The master latch is configured to secure the cap in the second position when the master latch is in a latched position. A safety latch is configured to secure the master latch in the latched position.