An inflatable device includes a top sheet and a bottom sheet to define a cavity when inflated such that the top sheet forms a top wall of the cavity and the bottom sheet forms a bottom wall of the cavity. The device includes a cavity junction connecting the top sheet and the bottom sheet configured to separate the cavity into a first cavity and a second cavity. The device includes a first port having a first opening in fluid communication with the first cavity and configured to allow passage of air into the first cavity. The device includes a second port having a second opening in fluid communication with the second cavity and configured to allow passage of air into the second cavity. The device further includes an opening in the cavity junction configured to allow air flow from the second cavity into the first cavity.