Designing Packaging That's Safe for Kids but Easy for Adults

Designing Packaging That’s Safe for Kids but Easy for Adults

Effective child-resistant packaging (CRP) must navigate two opposing challenges: making it significantly difficult for children under five to access potentially harmful products and remaining easy for adults to open and close. The Poison Prevention Packaging Act requires this balance, and achieving it depends on understanding the distinct physical and cognitive abilities of children versus adults.

The Science of a Successful Child-Resistant Package Design

Successful child-resistant package designs work by requiring actions that are difficult for children under five. These actions target specific capabilities that small children usually have not fully developed yet, including:

Fine motor skills for precise movements

Ability to perform two distinct motions simultaneously

Grip strength

Problem-solving ability

Packaging designs that leverage these limitations should still accommodate older adults with reduced dexterity.

Common CR Closure Types That Work

While many child-resistant packaging options exist, most designs fall into a few proven categories:

Push-and-turn: Consumers apply downward pressure while twisting the cap. Most young children cannot coordinate these two different motions simultaneously.

Squeeze-and-turn: Opening the cap involves gripping designated points on its side while twisting. It relies on grip strength and larger hand sizes.

Align arrows or tabs: This closure serves as a non-intuitive cognitive puzzle, requiring the alignment of symbols on the cap and container before lifting or twisting. It is simple for adults and works as an effective barrier for pre-literate children.

Unit-dose packaging: Blister packs isolate each pill or product in its own cavity, often requiring a push-through or peel-and-push motion. This packaging type makes it more difficult to access each dose, limiting how quickly a child can access it.

Each of these closure mechanisms addresses different aspects of the capability gap between young children and adults.

From Design Concept to Defensible Data

A good design concept is only the first step. To demonstrate design effectiveness under Consumer Product Safety Commission (CPSC) protocols, a formal test must be conducted with the actual product and container. At Perritt Laboratories, we provide rigorous child-resistant packaging testing services and the defensible documentation needed to support regulatory submissions for CRP designs.

Our testing protocols evaluate your design against the same criteria that regulatory agencies will use during review. We assess whether children in the target age range can access the contents and whether adults, including those aged 50 to 70, can successfully open and re-close your package. The data we provide serves as the foundation for your regulatory submission and supports compliance before you commit to production tooling.