Provided is a multi-chamber bag that is capable of containing a medicine having moisture-absorption characteristics or an easily-oxidizable medicine for storage. A dilute solution chamber 3 is interconnected with one side of a medicine accommodation chamber 1 via a weak seal portion 2, and an unoccupied chamber 5 having a port 4 is interconnected with another side of the medicine accommodation chamber 1 via the weak seal portion 2. The medicine accommodation chamber 1, the dilute solution chamber 3 and the unoccupied chamber 5 each are made of a transparent film material, and the opposite sides of the medicine accommodation chamber 1 each are releasably covered with a gas barrier film 6 having an aluminium layer本發明提供一種可收容保存具有吸濕性之藥劑及易氧化之藥劑的多腔袋。該多腔袋係在藥劑收容室1之一端側經由弱密封部2連設稀釋液室3,另一方面,在前述藥劑收容室1之他端側經由弱密封部2連設具有口部4之空室5;藥劑收容室1、稀釋液室3及空室5係由透明膜材形成,且,以具有鋁層之氣體障壁膜6可剝離地覆蓋藥劑收容室1之兩面。1...藥劑收容室2...弱密封部3...稀釋液室4...口部5...空窒6...氣體障壁膜6a...抓柄