For help with boxing corners see here.
This is a simple bag that really doesn't require much additional fabric aside from the old jeans.
Add a couple more details like a lining & freezer stenciling and you can have a bag like this. Notice the bow tie- I thought it's be a neat touch but it ended up looking a little too girlie! I was trying to hide a little fabric paint that went astray!
This tutorial is coming soon.