hey guys, need some opinion on which size of a bag to get, its for my mbp 13". First i bought the 15" incase nylon sleeve plus with handles, then after i got home reading some reviews i found out there is a 13" version so i went back to the store, and sure enough there was a 13" version so i got it exchanged. Now im not sure if i should keep the 13" version or swap it back to the 15" version. I not 100% sure but i think the 15" had much more room in the 2 front pockets. I will be using this laptop mainly for just carrying mbp, charger, some usb sticks and maybe some additional accessories. Anyone using the 15" version with their 13" mbp? any concerns? what do you guys think? stay with the 13" or get the 15"?