This is the final look of the bag.It is an ordinary backpack bought from outdoor clothes shop.($7)
There are 3 small very strong magnets placed downside of the bag.
This way you can easily take apart your tank bag as a backpack.
Step 1: Gathering Tools
What you need
1-A backpack which is not bigger than your tank.
2-Very strong magnets, you need 3 pieces and the surfaces must be clean and polish.
3-Tools for needlework