Larvae immediately leave the mother's bag and begin crafting their own bag-like covering.
Eggs overwinter in the pupal case, still inside the mother's bag, and these offspring hatch in the spring. After mating through an opening in the bag, the female fills her empty pupal case with fertilized eggs and eventually dies. She looks more like a cream-colored worm and remains in the bag after emerging from her case. A female does not form wings, antennae, or hair when she pupates. Once the caterpillar's life stage is over though, it pupates inside the bag it created and emerges a dark and furry moth with feathery antennae if it is a male. It moves slowly by first pushing the head out of the bag and then retreating it in order to advance forward. The plant-covered bag is carried along with the larva everywhere it goes. It is when it crawls around for food that people begin to notice it. The caterpillar spends much of its life in this makeshift bag, hanging from a branch, blending in with the tree. The debris depends on what is on hand or nearby when they are forming the cocoon.
Some individuals are covered in just pine needles, other in small bits of wood mulch. Bagworm Moth caterpillars wrap themselves in a silk cocoon onto which heaps of dead plant matter are laid. At first glance, the Evergreen Bagworm Moth's caterpillar looks like a moving pine cone, mystifying most observers that are unfamiliar with this family of moths.
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