Fortunately for us, we were able to raid the recycling bins at the local Safeway and Fred Meyer, where we acquired more than enough bags to conduct the test using strictly HDPE sacks. Each bag was carefully checked for post consumer contamination and moisture, ensuring that only the plastic and air were being tested. Then the bags were fluffed and piled. Using the specimen chamber lid, we stuffed the bags into the chamber one side at a time, rotating the lid to get to all sides more than once, thereby ensuring relatively even distribution.