The size 2 wildlife watching dust bag will hold a camera with a 300mm 80 400mm or 100 400mm lens attached 30cm maximum physical lens length the wildlife watching dust bag helps to protect the camera and lens from dust dirt and moisture this is especially important for digital cameras where simply moving a zoom lens can draw dust in using the dust bag gives that extra protection and peace of mind with the wildlife watching dust bag the camera and lens can be stored ready to use just lo