First things first, my goals with this project were to: 1) make a case for my guitar 2) to do it as cheaply as possible (i paid only 100 rubles (about $3) for the zippers) 3) kill lots & lots of time. I succeeded ;) Also, i was going for a "stuff i found in the garbage" look, but i will make recommendations on how to make your case look less "dumpstery" [they will be in these square parentheses].
Step 1: Supplies
[1) thick roll of cloth (i recommend nylon), 2) hardboard or thin plywood, + 3-14]
Step 2: Tracing & Cutting
Now you need a piece of cloth twice as thick as your deck that is long enough to go around the perimeter of your whole guitar & a piece of packing material as thick as your deck & as long as the latter piece of cloth.
When you cut the cloth, you should leave a few millimeters around the edges (you need to sew it onto your cardboard later).
Since you have your scissors out anyway, you should carefully cut the straps from your old backpack. Try to cut the strings holding the straps & not the straps themselves.
[instead of t-shirts use decent cloth (nylon). you should be able to trace the whole guitar & instead of cardboard use the hardboard or plywood].
Step 3: Taping & Pinning
Now that almost everything looks kind of like a guitar, you have to tape the packing material to the cardboard [hardboard] as seen in the picture.
When thats done, you should take 2 pieces of guitar like cloths and pin it around the cardboard like a pillowcase so that it can't slip out (picture).
Repeat the procedure with the other cloth, cardboard, & packing material.
Step 4: Sewing 1
[what i should have done was sew the backpack straps & zippers in at this point, but i didn't have them yet, so i did this later. you want to sew in the straps (padded side up) between the 2 pieces of deck shaped pieces of what will later be the back of your case on either side of the neck. Sew the ropey part to the bottom . I don't know how far apart (i did it by eye), you should try out a few different distances & pick one that is good for you. At this point you only want one side of your zipper sewed into the edge of the front side of your case (picture).]
Step 5: Pinning & Sewing 2
Sew the "taco" to the back of your case now.
Nows the time to choose how your case is going to open. If you like the way i did it, then you can sew up the right side of your case like i did. Or you can have it open from the bottom. I can't really hold your hand through this part (though you know i love you), but i marked the picture. Follow the white rabbit (little orange boxes. can you tell i'm a little sleep deprived?).
[Sew in the second half of your zipper where you haven't sewn your "taco" to the front of your case, i did this later, but you know this already]
Step 6: Finishing Touches
I already wrote this down already so i'm just going to copy/paste (sorry if it's annoying): "you want to sew in the straps (padded side up) to the back of your case on either side of the neck. Sew the ropey part to the bottom . I don't know how far apart (i did it by eye), you should try out a few different distances & pick one that is good for you."
there, that wasn't so bad was it?
I had 4 small zippers but i recommend using 1 long one. it'll be more comfortable.
Step 7: Conclusion!!
Why is this case eco-friendly? Because it's made from 95% recycled materials.
why is it in the back-to-school contest? Because guitar is often taught in schools (it was in mine, but i missed that chance. long story).
You guys are awesome & i love your comments. if you have anything to add or recommend, please do so, but just as a reminder please keep your criticism constructive. ;)