P.S. This is my first Instructable so sorry in advance for any spelling mistakes, bad pictures, or any thing else that I might have messed up on.
**Test Drive** Today i wore the backpack to school, everyone loved it. They thought it was store bought item and were amazed when i told them i made it myself (eventhough this is an extremly basic set-up). So build your own and impress all of your friends too.
Step 1: Materials
Speakers (of course, i used leftover speakers from a 70's era record player that was otherwise going to be tossed. Recycling!)
Medium gauge wire (just a couple feet will do)
Old 3.5 mm male audio jack (the kind you would find on a pair of headphones. Preferably you should leave 5-6 inches of wire on it or more.)
Amplifier (optional, makes the sound louder, duh)
5-6 inches of 4 inch PVC piping
~2 square feet of chicken wire
For Installing in Backpack
Wire stripping (Kleina tools make the best)
Step 2: Assembly
If you only use one speaker be sure to combine left and right audio wires so as to get complete sound.
If you choose to include an amp, try ripping one out of an old stereo or radio. Chances are you will be able to find one at a garage sale or Craig's list. This amplifier http://www.instructables.com/id/Simple-Powered-Pocket-Amplifier/ may work quite well.
Be sure that you make the wires long enough so that you can move your mp3 player and speaker around to fit your backpack.