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Ape Case Zipper, Adjustable/Clip-on Medium Size for Lenses The interior is nicely padded to protect the lens, but also has a good second layer of padding around the insides (in the shape of a tube) which is removable to change the inner size of your case. Depending on the circumference of your lens, you can hold the "tube" in place or remove it for a thicker lens. On the back of the bag there is a unique "criss-cross" strap and hook and loop fastening system that gives you the option to attach the case to either a horizontal strap (like a belt) or a vertical strap (as on a backpack) up to 3" wide. This adjustable/attachable case is made of durable nylon and features Ape Cases signature black on the outside and yellow on the inside. The yellow interior makes seeing a breeze. The zippered lid overlaps the side walls and provides extra protection from the elements. The medium size is suitable for most intermediate zooms such as 55-200 or 70-300 mm.