Abstract: A waterproof closure seal (20, 22) for closing openings on bags, pockets and other items having two components, a male (2) and female (1) component. The male component (2) has a planar base (12) with a wide insert having indentations (10a, 10b) on each side which fits into a cavity (8) on the female component (1) when pressure is applied on the outside of both components (1, 2). The female component (1) has legs (7a,7b) on each side of the cavity (8) with hooks (6a, 6b) which fit into the indentations (11a, 11b) on each side of the male insert (3) to better grasp the insert. The female component (1) may have one or more ribs (14) extending from it which fit into matching grooves (15) on the male cavity (2) to form an even better seal. An elastomeric overlay (16) can be molded on the male insert (3) to better maintain the seal even in extreme temperature conditions. The male and female component may be attached to each other at one end and used to seal a bag, such as a potato chip bag, to preserve freshness.