I got the new 13" Macbook Air and I also have an iPad. I want to know which size Timbuk2 bag would fit both comfortably and leave a little room for other "things." I think the small would suffice but can anyone who has it comment? Also I got the Colcasac Zagora sleeve and want to know if it will fit in the small sized bag while it's in the sleeve. Thanks for the help.