[header] How to care for mealworms [title] Keep the mealworms in a glass, metal, plastic or wax coated container. [step] You want to be sure they can't get a grip on the sides of the container you keep them in, as they could likely climb out. Containers with smooth, slippery sides and surfaces are best for keeping the mealworms inside. 
[substeps] Avoid containers made of things like cardboard, or any containers lined in fabric. These surfaces will be easy for the worms to latch onto and climb up, which could allow them to get out.