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)
Step 2: Chossing Speaker Size and Cutting Hole for Speaker
once you choosen the speaker size and have the mount ready its time to mark and cut the holes where the speaker will be positioned and mounted.
Step 3: Mounting the Speaker and Attaching the Wires
you can add a piece of tape to the wire connectors on the speaker for added protection and to keep it in place.
mount the speakers and run the speaker cable to where your amp is going to be. i ran my wire to the front pocket because that is where i have decided to mount my amp.
insert a binder if you want support to keep your speaker facing out.