A modular golf bag assembly and method of assembly are disclosed. The assembly includes: a golf bag body; a top collar attached to a top portion of the golf bag body; a bottom collar attached to a bottom portion of the golf bag body; a plurality of stays contained within the golf bag body and securely attached at respective ends to the top and bottom collars. In further embodiments, the assembly also includes a top divider configured for ratcheted attachment to the top collar and a base member configured to screwed onto the bottom collar.