Transparent sturdy plastic vials with a screw top lid. These vials are useful for containing a log roll in a small custom-made container and have been shown to resist moisture penetration; however, they may not be ideal for placement as a geocache on their own. They have not been tested long term to determine resistance to UV deterioration over time so best to place them where they are sheltered from direct sun. They are similar in size to a standard bison and therefore they can take the same log as a standard sized bison micro or a scuba style log.
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