Vertical action reclosable fastener and reclosable bag having same

A reclosable bag comprising:

• first and second opposing body panels fixedly connected to each other along a pair of sides and a bottom bridging the pair of sides;
• and
• a reclosable fastener extending along a mouth formed opposite the bottom, the fastener comprising:
• a first track including a first engagement profile and a first retention feature extending therefrom, the first engagement profile comprising a first hook portion opening in a first direction along a reference axis substantially perpendicular to a burst direction of the fastener, the first retention feature comprising a first upward extension and a first outward extension, the first track attached to the first body panel proximate a first area;
• and
• a second track including a second engagement profile and a second retention feature extending therefrom, the second engagement profile comprising a second hook portion opening in a second direction opposite the first direction along the reference axis and configured to engage the first hook portion in a closed configuration, the second retention feature comprising a second upward extension and a second outward extension, the second track attached to the second panel proximate a second area;
• wherein the first and second hook portions are configured to engage each other when the first and second tracks are urged toward each other along the reference axis to inhibit movement of the first track relative to the second track along the reference axis until at least one of the first and second upward extensions is urged in a direction transverse to the reference axis so as to allow the first and second hook portions to disengage from each other, wherein at least one of the first and second outward extensions has an undercut surface configured to disengage the first and second hook portions from each other when the undercut surface is urged along the reference axis.