A modular medical instrument sterilization container and related methods are disclosed. The container includes a base and a plurality of sidewalls, each being substantially planar and having a consistently repeated cross-section. A plurality of corner posts having a uniform, consistent cross-section is connected between the plurality of sidewalls. A plurality of bottom edge rails having a uniform, consistent cross-section is connected between a sidewall and the base. A plurality of top edge rails having a uniform, consistent cross-section is connected to the sidewall. A plurality of junction connectors are connected between one of the plurality of corner posts and at least one of: two of the bottom edge rails and two of the top edge rails.