In this instructable i would hopefully so you how you can create your own speaker backpack like the one pctured.
Step 1: TOOLS, EQUIPMENT, ETC...
tape (if necessary for taping the speaker contacts)
ITEMS: an old backpack (that you dont mind cutting up)
a old binder for support
a pair of speaker (the size is up to you)
a speaker plate or mount to hold your speaker in place
mini jack cable
rechargeable battery of 12v (do not exceede 15v)