Hi there! I do have the Dylan Bowler. I looooove it so much!
I measured it today and it is 15 in wide x 10 in high and the handles are nearly 9.5 inches drop, and it also comes with a detachable adjustable shoulder strap. On the LP site, it says the bowler is 17 inches wide (mine is not). Mine looks exactly like Sep's picture, so I honestly can't tell you the difference either, other than the speedy may be a bit bigger. Either way, they are so similar, I don't think you can go wrong with either choice!
Good luck!