In one example, a sterile container may include a tray having a plurality of walls at least partially defining a cavity. At least one of the plurality of walls may include an opening extending therethrough. The sterile container may further include a seal structure coupled to the tray. At least a portion of the seal structure may be received within the opening of the at least one of the plurality of walls. Additionally, the sterile container may include an extension structure coupled to the seal structure.