Final answer:
The most suitable bag to use when sending specimens to the laboratory is a plastic bag.
Step-by-step explanation:
When sending specimens to the laboratory, the most suitable bag would be a plastic bag. Plastic bags are commonly used in laboratory settings as they provide a good barrier against contamination and leakage.
They are also lightweight and durable, making them ideal for transporting specimens. It is important to ensure that the plastic bag is properly sealed to prevent any spillage or contamination during transportation.