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A mechanism or feature incorporated into or on the lid of a one piece child-resistant container which allows customization of the container by attachment of an independent, separate ancillary piece or identifier cap to the lid. The identifier cap may snap onto or be pushed onto the lid in a secure m

A mechanism or feature incorporated into or on the lid of a one piece child-resistant container which allows customization of the container by attachment of an independent, separate ancillary piece or identifier cap to the lid. The identifier cap may snap onto or be pushed onto the lid in a secure manner.

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1. An identifier cap for a unitary child-resistant container that includes a vessel portion and a lid portion connected by a living hinge portion, and the lid portion is configured to open via a “squeeze to open” mechanism, wherein the lid is opened from a closed position by a user squeezing the ves

1. An identifier cap for a unitary child-resistant container that includes a vessel portion and a lid portion connected by a living hinge portion, and the lid portion is configured to open via a “squeeze to open” mechanism, wherein the lid is opened from a closed position by a user squeezing the vessel at opposed sides adjacent the lid, the identifier cap comprising: a surface portion configured to cover at least a portion of the lid portion when attached to the lid;a cap connection feature configured to engage a corresponding lid connection feature; to establish a connection mechanism for securely attaching the cap to the lid and to resist forces tending to disconnect the cap from the lid, including forces generated by the “squeeze to open” mechanism to open the lid from the vessel, wherein:the cap connection feature includes a recess space defined by one or more surfaces of the cap and configured to receive a protrusion feature protruding from a lid surface to grip the protrusion feature by interference forces resulting from interference between the one or more cap surfaces and the protrusion feature;wherein the one or more surfaces include tips of a plurality of ribs extending inwardly from an external skirt portion toward a center of the cap, the ribs terminating short of the cap center to define the recess space, and wherein the plurality of ribs extend radially toward the cap center, a distance between the rib tips defining a dimension smaller than a corresponding dimension of the lid protrusion feature; andwherein the cap is a unitary structure fabricated of a plastic material which is harder than a plastic material from which the container vessel and lid portion are fabricated, such that the cap is configured to fit onto the lid portion with an interference fit between the protrusion feature and the tips of the ribs, such that the protrusion feature will give way and fit tightly into the recess space. 2. The cap of Claim 1, wherein the plurality of ribs consists of eight ribs disposed at 45 degree radial spacing. 3. The cap of claim 1, wherein the plastic material of the cap is a polycarbonate. 4. The cap of claim 1, wherein the cap has an outer periphery configured such that a portion of the cap is received within a recess in the lid. 5. A combination, comprising: a unitary child-resistant container including a vessel portion and a lid portion connected by a living hinge portion, the lid portion configured to open via a “squeeze to open” mechanism, wherein the lid is opened from a closed position by a user squeezing the vessel at opposed sides adjacent the lid;the lid portion comprising a lid connection feature including a protrusion feature protruding from a lid surface, and wherein the lid further includes a recess defined by a peripheral wall and the lid surface;a separate identifier cap configured for attachment to the lid portion, the cap comprising: a surface portion configured to cover at least a portion of the lid portion when attached to the lid;a cap connection feature configured to engage the lid connection feature, the cap connection feature including a recess space defined by tips of a plurality of ribs extending inwardly from an external skirt portion toward a center of the cap, and wherein the protrusion feature enters the recess space when the cap is attached to the lid and is gripped by interference forces resulting from interference between the rib tips and the protrusion feature, and wherein the cap has an outer periphery configured such that a portion of the cap is received within the lid recess as the protrusion engages the rib tips;wherein the plurality of ribs extend radially toward the cap center;wherein the cap is a unitary structure fabricated of a first plastic material, the container vessel and lid portion are fabricated of a second plastic material, and the first plastic material is harder than the second plastic material; andwherein the lid connection feature and the cap connection feature are configured to form a connection mechanism for securely attaching the cap to the lid portion, rigidifying the lid portion and increasing robustness of the connection between the lid portion and the cap against forces tending to disconnect the cap from the lid, including forces generated by the “squeeze to open” mechanism to open the lid portion from the vessel portion. 6. The combination of claim 5, wherein the plurality of ribs consists of eight ribs disposed at 45 degree radial spacing. 7. The combination of claim 5, wherein the first material is a polycarbonate, and the second material is polypropylene. 8. The combination of claim 5, wherein the cap is a first color, and the container is a second color different from the first color. 9. A plastic unitary child-resistant container, including a vessel portion and a lid portion connected by a living hinge portion, the lid portion configured to open via a “squeeze to open” mechanism, wherein the lid portion is opened from a closed position by a user squeezing the vessel at opposed sides adjacent the lid, the container further characterized in that; the lid portion includes a lid recess defined by a peripheral wall and a lid surface; the lid portion comprises a lid connection feature configured to engage a corresponding cap connection feature in a separate identifier cap to securely attach the cap to the lid by an interference fit and to resist forces tending to disconnect the cap from the lid, including forces generated by the “squeeze to open” mechanism to open the lid from the vessel; the container fabricated of a plastic material softer than a cap material of the cap connection feature; wherein the lid connection feature includes a protrusion feature protruding from the lid surface and extending above a surface of the outer periphery of the lid portion, and wherein the protrusion feature is configured to enter a recess space in the identifier cap defined by a plurality of ribs extending inwardly from a cap edge radially toward a cap center, and the lid portion is configured such that a portion of the cap is received within the recess space as the protrusion feature engages the cap.