Rockville4U Rack Bag Double-Sided Case with 12" Depth + Shoulder Strap (RRB40) Black

Ok, someone help me out here. Its this rack 8in depth or 12in depth. Title on the item says 12in but description says 8in...Im confused

Does this bag come in a 2U size?

what are the internal dimensions?

Does this rack have rear mounting rails? I see conflicting answers to this question. One says 'just front' other says "also rack on both sides".