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This mod is a fairly easy mod to put a pair of speakers in your backpack. you will need to know how to solder, sew, and you will need some common sence
 
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Step 1: Requirements

List of items:
a pair of computer speakers with input voltage of around 9 volts DC(check the output on the ac adapter)
Soldering station and solder
Wire
Backpack
Needle and thread
NiCD or NiMH battery pack to match voltage of speakers
battery charger
molex plug with input plug or plug set of your choice
3.5 mm headphone jack input
3.5 mm cable
Altoids tin
hot glue and hot glue gun
knife or other cutting tool

Optional:
bigger/better speakers to upgrade to ; )
Vijster1 says: Sep 18, 2011. 8:32 PM
http://www.instructables.com/id/MP3-Back-Pack-Speakers/
jg-stah says: Jul 16, 2011. 7:57 PM
how much would this cost
Jedrokivich says: May 16, 2011. 8:06 AM
lol "common sence"
gelvenchief says: Apr 7, 2011. 9:56 AM
i like this idea a lot but I have been trying to find a way to have a more advanced sound system in a bag. The places that i would be using the speakers are loud enough that just regular computer speakers wouldn't be loud enough. any ideas?
MJTH says: Jul 7, 2009. 5:16 AM
Is it possible to OVER charge?
zim0909 in reply to MJTHJul 19, 2009. 9:49 PM
if your talking about batteries then definitely. There are many things that influence how long to charge batteries for but for a general rule, stop charging if the battery gets warm. P.S. don't leave batteries charging unattended
CybergothiChe says: Jun 24, 2009. 2:26 AM
that's cool, G. Now I can be even more annoying!
limey_cricket says: Apr 8, 2009. 6:18 PM
Solder them to what?
limey_cricket says: Apr 8, 2009. 6:18 PM
I'm sorry; this step is a little unclear to me and I had a few questions. I'm using a set of computer speakers and I've opened them up. The "main" speaker has a cord coming out that connects to the computer. Do I just cut off the connector at the end and strip the wire? And um...WHAT exactly do I solder the wires to? (Noobish person over here! XD)
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