Wingspan c. 11mm.
This rather dull, unicolorous moth has a scattered distribution from the south of England through North Wales to Scotland, but is rather inconspicuous and may be easily overlooked.
The females have rather reduced forewings and an enlarged abdomen, and may not actually be able to fly. The males fly on sunny days between March and May.
The larva builds a portable case from pieces of grass or other vegetation, and probably feeds on heather (Calluna) or wild thyme (Thymus).