increase a file size?

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http://www.linuxquestions.org – hi, i have this directory with multiple images 'pics' and the size is 20mb, and i want to make a .zip or .rar package of this directory but with an increased size so the .zip/.rar file will be 100mb, and then when you extract it the file size is the original 20mb. can i do this? thanks for the help. (HowTos)