The Ecuadorian Sac-winged Bat is a small bat whose back and belly have different layers of fur color. It catches small insects in flight and roosts in caves or abandoned railway tunnels.
The back fur has three colors: blackish-brown tips, brown shafts, and pale grayish-brown bases; the belly is paler.
It catches small insects in the air and roosts in the twilight zones of caves and in abandoned railway tunnels.
The flight membranes are black, and the lower face is bare.
The ears are oval and extend slightly above the crown, with prominent ridges inside.
Head-and-body length is 37–42 mm, tail length 12–18 mm, and body mass 4–5 g.
An extinction-risk assessment has not been added yet.