Install windows 7 and ubuntu 12.04 from the same usb

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http://askubuntu.com – I am planning to do a fresh install of windows and ubuntu 12.04 on my laptop. I plan to do it with my 4 gb pen drive. What the problem is that I want to have both the bootable windows installer AND ubuntu installer together. (Because once I install windows I'd be formatting my drive and reserving space for the subsequent ubuntu install and I cannot make a bootable ubuntu) Is there a way to make a bootbale pen drive which would install windows and ubuntu both? PS: The windows iso is 2 gigs and the ubuntu one is like 700 mb, so it should fit in the pen drive, right? (HowTos)