There is a very popular Sci-Fi TV show called Doctor Who. The main character of the TV show is "The Doctor". The Doctor travels all of time and space in the TARDIS or the Time And Relative Diminsion In Space.
There is also a very popular Sci-Fi convention in Atlanta, GA called Dragon*Con that I like to attend every year. For Dragon*Con this year, I decided that I wanted my purse to be a TARDIS. So this is the process I used to create my TARDIS backpack.
I decided that sewing a backpack together would be to hard. So I decided to make one out of plexiglass.
The first thing I did was decide how big I wanted to backpack to be. I created 5 squares that size in Inkscape. I then cut the plexiglass with our 40 Watt Laser Cutter. I taped the 5 pieces together to form the main part of the TARDIS.