Provided is a fitment bistable pull-snap hold open mechanism including a flexible first and second flat, strip like members with one or more pivot members integrated into the second flat, strip like member. The first flat, strip like member is coupled to the second flat, strip like member at their respective ends with two or more bonding points. The one or more pivot members include a vertical living hinge and a flexure, which allows the mechanism to be biased between an open configuration and a closed configuration. The vertical living hinge does not extend to the top edge or the bottom edge of the second flat, strip like member to improve the integrity of the mechanism. The first and second flat, strip like members are applied proximate the opening of a flexible package on the inside walls and allow the package to be maintained in the open position for removing its contents.