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A child-proof locking system for a slide fastener includes a slide which engages a pair of molded plastic interlocking strips. The slide is carried in a puller having a proximal grip and a distal latch. When the slide fastener is closed, the puller seats in a strike, with the latch having a pluralit

A child-proof locking system for a slide fastener includes a slide which engages a pair of molded plastic interlocking strips. The slide is carried in a puller having a proximal grip and a distal latch. When the slide fastener is closed, the puller seats in a strike, with the latch having a plurality of arms abutting a distal end of the strike to lock the puller. To open the slide fastener, the latch arms are pressed inwardly with one hand, to clear the strike, while the grip is pulled away from the strike with the other hand.

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1. A child-proof locking system for a slide fastener, the slide fastener comprising a pair of interlockable flexible plastic strips, a slide engaging each strip, the slide being movable between an open position at one end of the fastener, wherein the strips are separated, to a closed position at an

1. A child-proof locking system for a slide fastener, the slide fastener comprising a pair of interlockable flexible plastic strips, a slide engaging each strip, the slide being movable between an open position at one end of the fastener, wherein the strips are separated, to a closed position at an other end of the fastener, wherein the strips are interlocked, the system including a puller and a strike, the slide being fixed to the puller, the strike being fixed at the other end of the fastener, the strike including a passage, the passage receiving at least a transition portion of the puller when the slide is in the closed position, the puller including a latch, the latch extending beyond the passage toward the other end of the fastener, the latch including a pair of coplanar arms and an arm which deflects along a plane perpendicular to the coplanar arms, each arm including a stop, the stops being in engagement with an edge of the strike to prevent the puller from moving toward the one end of the fastener, the arms being deflectable to positions wherein the stops disengage the edge of the strike, whereby the coplanar arms may be deflected by being compressed between one's thumb and middle finger while the arm which deflects along the perpendicular plane is simultaneously depressed by an index finger of the same hand to withdraw the puller from the strike and move the slide to the open position. 2. A child-proof locking system for a slide fastener in accordance with claim 1 wherein the puller includes a grip, the transition portion being positioned between the grip and the latch, the transition portion having transverse dimensions less than those of the grip and the latch such that the transition portion seats within the passage. 3. A child-proof locking system for a slide fastener in accordance with claim 1 wherein the strike comprises an arch, the passage being defined by the arch. 4. A child-proof locking system for a slide fastener in accordance with claim 1 wherein the latch comprises a smooth tapered exterior surface which engages the passage to deflect the arms inwardly, such that the latch arms enter and pass through the passage when the puller moves the slide toward the other end of the fastener. 5. A child-proof locking system for a slide fastener in accordance with claim 1 further including a flexible bag formed of tear resistant material, the bag having an access opening defined by a pair of edges, one of the flexible strips being affixed to one edge and an other flexible strip being affixed to the other edge. 6. A child-proof locking system for a slide fastener in accordance with claim 5 wherein the flexible bag comprises two panels, the strike comprising an arch and a base, the base including a pair of legs, the legs having mounting studs, the panels having apertures registered with and receiving the mounting studs for securing the strike to the bag. 7. A child-proof locking system for a slide fastener in accordance with claim 6, the strike further including an anchor base, a web joining the anchor base and the base, the base abutting one of the panels and the anchor base abutting the other panel with the mounting studs extending through apertures in the anchor base. 8. A child-proof locking system for a slide fastener in accordance with claim 5 wherein the strike comprises an arch and a base, the base including a pair of coplanar legs, the legs having leading edges with inwardly tapered surfaces, the latch comprising a smooth tapered exterior surface which engages the inwardly tapered leg surfaces to deflect the arms inwardly, such that the latch arms enter and pass through the passage when the slide is moved toward the other end of the fastener. 9. A child-proof locking system for a slide fastener in accordance with claim 4 wherein the strike comprises an arch and a base, the base including a pair of coplanar legs, the legs having leading edges with inwardly tapered surfaces, the coplanar arms comprising smooth tapered exterior surfaces which engage the inwardly tapered leg surfaces to deflect the coplanar arms inwardly, such that the coplanar arms enter and pass through the passage when the slide is moved toward the other end of the fastener. 10. A child-proof flexible bag formed of tear resistant film, the bag having an access opening defined by a pair of edges, the bag further including a slide fastener, the slide fastener comprising an interlockable flexible plastic strip affixed to each edge, a slide, the slide being movable between an open position, at one end of the fastener, wherein the strips are separated, to a closed position, at an other end of the fastener, wherein the strips are interlocked, the bag further including a puller and a strike, the slide being formed of one piece construction including a base engaging each strip and a neck projecting from the base, the puller including a socket, the neck being fixed within the socket formed in the puller for unitary movement of the puller and the slide, the strike being fixed at the other end of the fastener, at least a portion of the puller being engaged in the strike when the slide is in the closed position, the puller further including a latch, the latch engaging the strike when the slide is in the closed position for preventing the portion of the puller from being disengaged from the strike. 11. A child-proof flexible bag formed of tear resistant film in accordance with claim 10 wherein the latch includes a plurality of arms, each arm including a stop, the stops being in engagement with an edge of the strike to prevent the puller from being disengaged from the strike. 12. A child-proof flexible bag formed of tear resistant film in accordance with claim 10 wherein the puller is formed of one piece molded plastic construction. 13. A child-proof locking system for a slide fastener, the slide fastener comprising a pair of interlockable flexible plastic strips, a slide engaging each strip, the slide being movable between an open position at one end of the fastener, wherein the strips are separated, to a closed position, at an other end of the fastener, wherein the strips are interlocked, the system including a pair of elements, the slide being fixed to one of the elements, the other element being fixed at the other end of the fastener, a first element including a passage, the passage receiving at least a portion of the second element when the slide is in the closed position, the second element including a latch, the latch including a pair of coplanar arms and an arm which deflects along a plane perpendicular to the coplanar arms, each arm including a stop, the stops being in engagement with an edge of the first element to prevent the second element from moving relative to the first element, the arms being deflectable such that the stops disengage the edge of the second element, whereby the coplanar arms may be deflected by being compressed between one's thumb and middle finger while the arm which deflects along the perpendicular plane is simultaneously depressed by an index finger of the same hand so that the first element and the second element can be separated and the slide moved to the open position. 14. A child-proof locking system for a slide fastener in accordance with claim 13 wherein the first element comprises an arch and the passage is defined by the arch. 15. A child-proof locking system for a slide fastener in accordance with claim 13 wherein the latch comprises a smooth tapered exterior surface which engages the passage to deflect the arms inwardly, such that the latch arms enter and pass through the passage when the slide moves toward the other end of the fastener. 16. A child-proof flexible bag formed of tear resistant film in accordance with claim 10 wherein the puller includes a grip, the socket being formed in the grip. 17. A child-proof locking system in accordance with claim 14 wherein the first element further comprises a base, the base including a pair of coplanar legs. 18. A child-proof locking system in accordance with claim 17 wherein the first element further includes an anchor base and a web joining the base to the anchor base.