A vacuum posture cushion is in essence a beanbag from which the air is removed once the desired shape is achieved to retain that outline. Versions range from simple rolls to mattress-sized. Its ability to retain its shape and perfectly mirror/correct the user’s anatomy means there is no need for frequent re-plumping of cushions, moving the person to avoid pressure sores. Its design and construction makes it suitable for numerous scenarios, including supported bathing, sleeping, sitting, in wheelchairs, canoes, aircraft… the list is endless. See https://www.aatgb.com/posture-cushions/ to appreciate the diversity of uses.