I'm 5'3", 120 lbs and carry a lot of stuff...(i.e. sunnies, wallet, ipod, cell phone, car keys, etc) do any of you know from personal experience (i.e. trying it on at a store) which would "fit" me better? Does the 30 give A LOT of room after all of those? i'm debating between that and a tikal gm....any input would be greatly appreciated!