Velcro seal ensures easy opening and secure closing! With leeches in a Tamer, changing water is simple. The Lil Leech Tamer's finer mesh keep smaller panfish-size leeches where they belong. Leech Tamer and Lil Leech Tamer can be used to rinse and temporarily store clean nightcrawlers on ice in a cooler. Put crawlers back into bedding for long term storage. Crawlers are handy, and hands stay clean!