Final answer:
The question likely pertains to a scientific procedure requiring a durable and size-specific impervious plastic bag with hand-like appendages designed for material handling, possibly used in an environmental or marine study.
Step-by-step explanation:
The subject of the question seems to be describing an impervious plastic bag with specific dimensions and features that can be used for handling materials in a scientific procedure. The question itself does not provide enough context to determine a specific experiment or use for the bag, but it could relate to an activity where containing or transporting certain substances without leakage is crucial, such as in marine biology or chemistry experiments.
Considering the additional information provided, the bag might be part of an experimental setup or a procedure to conduct scientific observations or to measure certain environmental variables. For instance, the description of a plastic cover for refills or structural components of a cover made of traction-resistant plastic and geotextile indicates materials well-suited for robust fieldwork or outdoor scientific investigations.