The total comes to about 27 megs. Which if you have a 128 mb drive like I do, you are left with 100 mb. I have not had a problem with it, it's really convient for working on multiple computers.
Everthing has been tested on multiple computers and run fine from the thumbdrive. Just unzip the files to the thumbdrive and there you go, I personally have them under a directory called "progs" but you can organize as you wish.