Consider the procedure you can follow to test how well a material wrapped around a container insulated it.
Place the steps in order from start to fin.
My answer:
1. Find the mass of an empty container wrapped in a material with the lid.
2. Add ice to the container and find the total mass, including the lid.
3. Close the container for 30 min.
4. Open the container, pour out any water, and find the total mass, including the lid.
Hope I could help!