Instructables
This is a bag extender. It's basicallly a bag that straps around a regular backpack so you can have more storage. In my case I wanted to keep my cycling gear in a bag separate from my school stuff so it won't get wet. The bag has an insulated inside to keep the wet in and it's made of recycled materials. Best of all it's orange!!!
 
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Step 1: Sizing!

So first off what kind of things do you want to bring along and how big are they? I wanted to carry my cycling gear which includes my helmet, running pants and jacket, underarmor shirt and shoe covers. I'm biking in the winter so it will be all wet and slushy so I wanted my bag extender to have some kind of water resistant barrier.

I took the largest object, my helmet and a piece of fabric and wrapped it around my fully loaded school bag, math textbooks and all. This should give you a general size as to how big the external bag should be.

My bag is made in 3 parts, outside bag, inside bag and water barrier. All three of these layers are sewn together to form one nice solid bag. There is an elastic drawstrap at the top that closes it all up. The extender bag is held on to the school bag using two straps with clips on them.

Step 2: Making water resistant

To make the bag water resistant I used a layer of plastic sewn to a fabric layer. The plastic layer is made of old plastic shopping bags melted down to make a tyvek like material. I got the idea for the material from a Make weekend project: http://blog.makezine.com/archive/2007/06/make_a_messenger_bag_out_1.html

The fabric/plastic layer didn't look so good by it self so I put this layer into another fabric layer.
OutThere5 years ago
Great! So easy..I'm going to add one or two straps that run vertically for more stability on mine.
i might use the same idea but attached to my bike, i'll probably make an instructable too, great instructable
IdahoDavid6 years ago
I great idea and informative Instructable. Well done.
LinuxH4x0r6 years ago
Great idea. You can get tyvek for free from the usps (post office). They have envelopes that are made from it and they give them out for free!
distortedlabs (author) 6 years ago
it does look quite funny but I still like it. The orange is good if your riding so people can see you and orange is just plain awesome. As for my sewing technique...I am self taught but that's no real excuse, still it got the job done
theRIAA6 years ago
i like it, but your sewing technique could use a little work
Impressive! That's a nice idea, but it does look quite funny, but overall, great job!