I have an old chest freezer, that I threw some in a couple weeks ago. I caught them locally and wasn't headed to the lake for several hours. In an effort to keep them fresh I thought I would try, they were laying on the bottom of the 5 gallon bucket when I got home and I put them in the tank, three hours later they were all very lively and fresh. I know they would not have lasted for long though they were bloodying up there gills and mouths hitting the side of the tank, but it will work for a while in a pinch.