There are three bands called First Aid Kit: 1. Swedish indie/folk duo consisting of the young sisters Klara and Johanna Söderberg from Stockholm.
The debut EP "Drunken Trees" was released on the 9th of April 2008 in Sweden on the label Rabid Records, owned by the Swedish electronic duo The Knife. The EP was re-released through Wichita Recordings early 2009.
Their debut album The Big Black & The Blue was released on January 25th, 2010. Source