What the standard asks for
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It is written as performance, not design
1700.15 sets out what packaging has to achieve to count as special packaging within the meaning of the Act, and leaves the construction to you. There is no approved list of closures, which is why a supplier calling something child-resistant is a starting point and not a finding.
The effectiveness specifications
Tested by the method in 1700.20, special packaging must show not less than 85 percent child-resistant effectiveness without a demonstration, and not less than 80 percent after a demonstration of the proper means of opening. Those are population figures from a protocol, not bench impressions.
Adults have to be able to open it
The same test method addresses adult use, which is the tension in every child-resistant package: too stiff and the customer decants it into something unlabeled, which is a worse outcome than the one the rule was written for.
No reuse
Special packaging for substances subject to those paragraphs shall not be reused. If part of your proposition is a refillable bottle, check which paragraph you are under before the marketing is written.
Restricted flow, where it applies
Where a paragraph calls for it, the package must be one from which no more than 2 milliliters can be obtained when inverted, opened and squeezed or activated once. That is a specific number and it shapes the orifice, not the label.
Sample packages go to the Commission
The manufacturer or packer must provide the Commission with a sample of each type of special packaging, with the labeling for each size and for any noncomplying package. It is an obligation with an address attached, so treat it as part of the launch rather than an afterthought.
Performance standards cut both ways
Because nothing is prescribed, there is no part number that discharges the obligation, and equally no construction is ruled out if it performs. That is more freedom than a design standard would give and more responsibility, and the responsibility is the half people underestimate.