A good portable pen case for nurses should have the following features: - Durability: Made from sturdy materials that can withstand frequent use. - Multiple Compartments: Separate sections for different types of writing instruments. - Portability: Compact size that fits easily into a scrub pocket or nursing bag. - Ease of Cleaning: Made from materials that can be easily wiped down or washed. - Secure Closure: Zippers or snaps to prevent pens from falling out.