Odyssey s BR series rack bags are made of tough 800 denier ballistic nylon to take the punishment of transport. All bags include a shoulder strap chrome-plated lockable zipper pulls and roomy exterior zippered pockets for storing mics and other essentials. They re uniquely designed to allow you to remove the interior hard shell from the padded bag. This allows them to be stacked firmly on top of each other without the bag getting in the way and the black carpet covered shells are studio furniture friendly with no feet or metal edges to damage or mark surfaces. Great rack bags built for the music industry professional. Available in 3U to 5U sizes with interior depths of 8 12 or 16 .