I have offered in the past a willingness to test for bactericidal effects after storage. Due to the labor involved, I would give a qualitative answer (yes or no) as to their ability to kill a hefty load of common water borne bacteria. Also, we use liquid tight plastic vials (generally polycarbonate or polypropylene, some snap cap, some screw down) for storing a variety of biological and chemical materials. While I don't want to take any from the lab, I often receive samples, I would be willing to send a few out (domestic US) to couple of people who may want to test run them for the group. When bought in bulk, they are generally .10 to .15 each. They also come in a longer size, which would be useful for storing a couple of sewing needles. Pete