An air cell including a strip body and a waterproof air-permeable cover is provided. The strip body has an air hole, a upper surface, and a side surface integrated with the upper surface. The upper surface is constituted by a air-permeable region and a airproof region. The side surface and the airproof region is made of airproof material, and the air-permeable region is constituted by a opening. The waterproof air-permeable cover is disposed at the strip body and covers the opening. When the air cell is in a use state due to air inflation through the air hole, part of gas in the strip body flows out of the air cell through the waterproof air-permeable cover. The area of the air-permeable region is smaller than the area of the airproof region. In addition, an air mattress and an air mattress system including the air cell is also provided.一種氣囊,包含一長條狀囊體與一防水透氣覆蓋件。長條狀囊體有一氣孔、一上表面及一側表面,側表面與上表面連接。上表面由一透氣區和一不透氣區構成。側表面與該不透氣區是由一不透氣基材所形成。透氣區是由一開口構成。防水透氣覆蓋件是配置於該長條狀囊體且覆蓋該開口。氣囊經由氣孔充氣而處於一使用狀態時,氣囊內的部分氣體經由防水透氣覆蓋件而流至氣囊外,且氣囊外的溼氣藉由該防水透氣覆蓋件而避免進入氣囊內。此外,該透氣區的面積小於該不透氣區的面積。另外,本發明也提供包含上述氣囊的氣墊床與氣墊床系統。210‧‧‧氣囊212‧‧‧長條狀囊體212a‧‧‧開口212b‧‧‧氣孔212c‧‧‧側表面212d‧‧‧上表面214‧‧‧防水透氣覆蓋件216‧‧‧不透氣覆蓋件R1‧‧‧透氣區R2‧‧‧不透氣區T1‧‧‧縫合跡線
