The Frank Thomas is the Lid Lugger Max (it's bigger than the Lid Lugger Sport). Supposedly you're not suppose to carry the helmet in it while riding but it seems OK for me. I don't feel any extra turbulence or drag. I bought this one because the various honeys that wanted to go riding with me need to have something for their noggins. The Ogio 2150 refers to its capacity in cubic inch, I believe. Short version: Frank Thomas = junk. Ogio = good stuff. Frank Thomas products are very cheesy and crappily made. So, why do I have it? Because so far that company is the only one that I know of that makes a rucksack that can carry a helmet AND still have room left over for a few things like clothing changes, personal hygiene kit, etc. I use the Ogio whenever I want to carry a couple extra sets of clothings for sleeping over at peoples' houses AND don't have to worry about carrying an extra helmet.