The strong-bodied male has broad, fringed wings with a wingspread averaging 25 mm (1 inch). The wormlike female lacks wings and, in most species, remains in her bag during mating, where she will also later deposit her eggs. Female evergreen bagworms (Thyridopteryx ephemeraeformis) lay their eggs within their bags and then crawl out of the bags and fall to the ground, where they die. Bagworm larvae are often destructive to trees, especially evergreens.

Encycolpaedia Britannica 

Location: Upper Seletar Reservoir – Jan 2022

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