I have kept them right here in my yard for a couple weeks. I put them in a burlap bag, not plastic, but burlap. I take it down to the river a couple times a week in the evening and lay it down and let them get a drink for about 10 minutes. This also wets the sack good. I put it inot a bucket for transport and bring it back to the house. I then place it into a larger plastic tube where they can spread out a bit yet still be within the burlap sack and dump any salt water from the bucket over the sack to dampen it. Its now good for a couple more days. I keep them up against a stockade fence that is under a tree and out of any sunlight. Then when I go fishing I can even place the sack into the livewell for a while to give them a little reviving.