This is the SIGMA genuine lens case bag LS-205L. It's a lens case with a cushion pad and comes with a strap so it can be used as a shoulder bag. I think it would fit a single-focus lens with a large aperture. The size is as follows (measurements are approximate): ◎ Outer dimensions W15 x D15 x H15cm ◎ Inside ・ Recess on the inside of the case lid to support the lens: Diameter 75mm, recess depth approx. 11mm * This is the part that supports the lens by inserting the rear cap on the mount side. ・ W11 x D11 x h10cm (+ pad thickness 2cm) I don't smoke. Please consider the above.