The D/Focus Systems D/Matte Complete Matte Box with Custom Case Kit from B&H includes an 15mm rod-mount and clip-on matte box and a configurable Porta Brace case. The matte box has an 86mm lens opening.
The matte box can be attached to 15mm rods via a swing-away bracket underneath, or it can be clipped onto a lens, or both rod-mounted and clipped on. It includes siders and an eyebrow, two 4 x 4 filter slots, one rotating, and an 86mm to 82mm step down ring, which will let you mount any lens with an 82mm front outer diameter.
The Porta Brace case features adjustable dividers that can be set to securely hold the matte box or alternatively a camera and lens package. The case has a water-resistant Cordura nylon exterior, a padded interior, and a zipper closure.