The Sentinel is our newly designed rental and entry level BCD. It is engineered to withstand the rigors of rental programs around the world. New durable fabrics and components make the Sentinel an easy choice for everyone. 1000D Nylon Compact Jacket Style Air Cell.AKONA BC Pro Kit and QuickClip â? Available sizes: 2XS - XL. 1000D Nylon Compact Jacket Style Air Cell, 1680D Nylon Jacket Fabric, Two Large Velcro Pockets, Sternum Strap. Scuba Diving Equipment is intended for use only by properly trained and Certified Scuba Divers, within the parameters of their certification credentials. Scuba Diving is potentially dangerous and can lead to death.