We take our crawlers in a large styrofoam box, like the ones you get Omaha Steaks in. I'm sure a medium sized cooler of any kind would work fine. For the trip we put the worms in bedding material with a few layers of wet newspaper on top of it and then a couple of 1/2 gallon milk jugs with frozen water in them. Once we get to camp, refrigerators are available. If there is room in the fridge we set the box in the bottom. If there is not room, refreeze the bottles and keep them in the box. The camp we go to has free ice so ice in a ziplock bag will work but if the bag leaks, the bedding can get too wet. If you use the bags I would recommend double bagging. We usually take 500 crawlers for six to eight fisherman and have never run completely out in a week of fishing. We break off about a third or fourth of the crawler and put it on our jigs so they last a lot longer. You can usually catch more than one fish before having to rebait. As long as a small piece remains on the hook the fish will still bite it.

As far a burying a box I guess it would work if you have a shovel you can dig a hole in a rock with. There is not much soil over the rock and I'm not sure the camp would want you digging holes anyway.