Think Tank Whip It Out, Lens Belt Pouch for the 70-200 2.8, 80-200 2.8, 100-400 and Similarly-Sized Lenses. Lens is put into the bag upside down Vertical auto-locking zipper Seam-sealed raincover: Unique to Think Tank Photo, all of the rain covers are seam-sealed for protection, similar to outdoor clothing and jackets. This is necessary to prevent the water from leaking into the bag where the raincover is sewn together Front mesh pockets for lens caps: The stretchable mesh pockets are designed for items that you need to remove and retrieve quickly while shooting like lens caps. They are also handy for other essentials like sunscreen, lip balm and other small items Attaches to Pro Speed Belt: The Modulus components can be attached to the Pro Speed Belt and can either "rotate" or "lock" on the belt. In this photo, the Speed Changer has been rotated directly over the front pocket for convenience and comfort