How to Keep Fish?

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Most of the time when I go fishing, I practice catch and release, however, there are times when I catch a nice sized fish that I wouldn't mind taking home to eat. I usually am not done fishing though, and being as I am knee deep and continually moving up stream, I usually let it go because I don't know how to keep the fish with me without it being too much of an inconvenience. Any ideas or methods on what you do in this situation?
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