There are many ways to have nightcrawlers ready to go for your next fishing trip. One of the oldest and most used methods has been a crawler bin at your home. This can be as simple as a 3x3x3 planter box or even a wine barrel filled with good soil. Try to stay away from unnatural materials like metal or plastic, as they can heat up faster than containers made from natural materials. If you plan on having your box above ground, remember that crawlers prefer the dark. So dont use transparent materials.
My grandpa had a box buried in the ground in back of his house. He had strategically placed it near the house, in a shadier flowerbed. This method accomplished a couple of things. First, it kept the worms in a central location and ready to quickly dig up on his next fishing trip. Second, it insured that the worms would not get too hot in the summer months. And third, the out of the way location meant nobody would trip and fall into it. If you decide to put your box in the ground, be sure not to have to soil go all the way to the top or your worms will pull a Houdini and escape.
After each fishing trip, Grandpa would put the unused nightcrawlers into the box. This way...