i got this "Point Mobl" Laptop Backpack. states as Universal fits laptops up to 15.6 of screen size although thats the measurement for the SLEEVE.
I bought it from Radioshack for just 29.99 (plus tax) and it fits snug. I bought it for my G73JH which is a almost the same sizes as the G75 you have. you wont be able to use the sleeve though..
the Corners dont get too caught like i said its a real snug fit.
bag is decently padded, and has quite a basic design to it too.
Comfort is also okay, not like those basic and "big student" jansports. at least the back cushion is decent too.
lots of other pockets can fit other stuff and laptop necessities like the huge power brick, a mouse, and probably an external keyboard.