The Tempest Advanced 100 Inner Capsule creates a fully enclosed inner compartment with a stitched-in groundsheet. Specifically designed for the Tempest Advanced 100, it is perfect for keeping out rodents and any other unwanted guests, and it also significantly reduces condensation. The Inner Capsules are super-easy to fit via the toggles, and there are some clever internal storage solutions to be found. The vents also mirror the Adaptive Ventilation™ system of the bivvy.