The BUDDYSWIM Detachable Backpack Trellis Safety Buoy is designed to allow the buoy to be used as a backpack out of the water. Easily remove the trellis and store it inside to use as an open water swimming buoy. Keep safe and seen in the water with the Buddyswim swim buoys. This backpack buoy is perfect for triathlon training and doubles as a drybag, swim bouy and backpack!