Think Tank Lens Drop In Soft inner lining protects the lens: The inside of the Lens Drop In features a super - soft lining so that your teleconverter or other lens can be dropped in without the lens caps, for the fastest insertion and retrieval Lightly padded/ compressible: It is lightly padded to make them friendlier to use and they are compressible for travel purposes. The cases are padded with 1/8" - 1/4" of foam (3-5 mm) which is plenty to protect your lens 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 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 Attaches to Speed Belt Packs: It can be attached to the waistbelts of the Speed Demon, Freak, or Racer, for added capacity