So lets begin!
Duct tape is super awesome to work with. It is super strong, and it is waterproof! So for the back to school contest, I decided to post an Instructable on the most essential piece of school gear needed: The backpack! Yeah, so in high school(or our school at least) we have to bring our backpacks pretty much everywhere, so I figured that a duct tape(or duck tape) backpack will help me customize it to whatever I need, and it will be durable.
So then, I decided to add a bit of my creativity into this project and I made it able to convert into a messenger bag too!
Step 1: Stuff You Need
Duct Tape: Of course you need duct tape for this project!
Scissors or a cutting knife: You need something to cut the tape
Backpack: Wait, WHAAAT?? Yes, you should have a backpack for this project. It isn't needed, but its a great place to salvage some extra stuff. You should obviously use an old backpack, for instance, the one I used was too small for high school so it is perfect to be ripped up. Pretty much for this project, you will need the padding inside the backpack, which can be replaced with many layers of duct tape, or you could just get styrofoam sheets. The other thing we need is to make the messenger bag straps adjustable. I don't know what they are called yet, so I will call them thingies. These are obviously better if taken from a messenger bag.
Velcro: Ahh, velcro, the easiest way to make something open and close. Plus, as I said, I had it on me! So this is used to open and close the backpack. I don't know if I can use zippers, since I never used those, but tell me if it works! Additionally you can use magnets for this project, but I do not trust them around my stuff.
Ruler: You will never know when any measurements can come in handy.
Step 2: Problem Points
Straps: You are carrying the backpack by these, so you need them to be super strong. Straps break from regular backpacks too, so it needs to be strong. Also, make sure that you pad it, or it will hurt when you carry it!
Bottom: Here is where the books lie in, so you need it to be strong. Duct tape is a bit too flexible, so make sure that the bottom is reinforced with something, cuz you don't want the bottom to sag when its on your back.
Back: The back is also pretty flexible, which means that it would be pretty uncomfortable if you lean on the backpack when it has books inside.
Step 3: How to Work With Duct Tape
Strip: Its just a strip of duct tape. Usually it is two pieces of duct tape stuck back to back.
Sheet: A sheet of duct tape. Usually a bunch of strips stuck in a sheet and is double sided.
Fabric Stick: Yes, I made this one 100% up, but it is how pieces of fabric are usually sown together at seams. It is used to tape some sheets together at an angle. Check the picture out. Also check out other backpacks etc. to see what I am talking about.
Step 4: Duct Tape Hints
1: Make sure that when you cut the tape, it is held taut. If you don't, then the tape will fold on itself and it won't cut properly. Also, it will make the cut straighter.
2: When putting a strip of tape on another strip of tape, make sure that both strips are taut. Again, like the previous tip, if both are not taut, then creases will come onto the taps.
3: When you tear out strips, if they are not being used at that time, make sure that they are REALLY far away. I do admit that it should be obvious, but I've made many mistakes because of this.
Step 5: Lets Make the Straps
Step 6: Creating the Back
Step 7: Creating the Messenger Bag Straps
Now cut a huge strip of tape, which will be the messenger bag strap. The one I created was 3.5 feet.
Step 8: Creating the Messenger Bag Straps: Part 2
Step 9: Get the Back Again
Also, when taping the straps, place a strip of tape on the top, and anchor it to the front of the backpack.
Step 10: The Bottom, Sides, and Front
For the sides, get a sheet which is as thick as the bag by a few inches less than how tall the bag is(so you could have a cover for the bag). First fabric stick it to the left and right edges of the back. Then, stick it to the bottom. You will need to do this twice.
Now, we are on the front! This is yet again another sheet of duct tape, which the same measurement of tallness you used for the sides by the length of the bag. Do the same stuff you did before, and stick the front to the sides and the bottom.
Anchor the bottom of the straps to the front of the bag by taping a strip to the bottom of the 2 straps and taping the other side to the front.