Back in the early 80's a friend and me went to Canada on a week long fishing trip, and we took several several crawlers with us but we used newspapers. We used a styrofoam(sp) cooler put a few sheets of the newpaper down on the bottom then a layer of crawlers then another several sheets of the newspaper and so on until we had what we thought would be enough crawlers for the trip, each layer of paper would be wet enough to maintain enough moisture to keep the crawlers alive and lively, this process worked very well for us on that trip.
To Whom Much Is Given, Much Is Required