Final answer:
The double-bag process is performed when a biological sample needs to be transported or stored in multiple layers of containment for safety purposes in biological research laboratories.
Step-by-step explanation:
The process referred to as "double-bag" is performed when a(n) biological sample needs to be transported or stored in multiple layers of containment to minimize the risk of contamination or leakage.
For example, if a researcher needs to transport a potentially infectious sample they would place the sample in a primary bag, seal it, and then place the primary bag inside a secondary bag, which is also sealed.