Step 1: Gather Materials
Material - I chose this fabric because it was lying around, and is quite thick, making it suitable for the task at hand.
Scissors - the sharper the better
Thread - preferably of a similar colour to your material
Sewing Machine - you could probably do all of this by hand but i'm lazy.
Laptop - for measuring, and for using with the sleeve after construction.
Pen - preferably something that will wash off, i didnt have this so used a marker that was handy.
Step 2: Roll It Up
Step 3: Fold It Over
Step 4: Mark the Seam
when you have done this transfer the marks to the back side of the material as accururately as possible. If its not perfect it doesnt matter, but as long as they are close.
Step 5: Pin It Together
Step 6: Check the Fit
Step 7: Sew It Together
Step 8: Trim the Excess
Step 9: Close the Bottom
When you have done this trim as before.
Step 10: Hem the Opening
fold under the open end of the bag to create a neat looking folded edge. you could put a loop of elastic inside to hold the bag closed, mine was a snug enough fit without it though.
around the opening of the pouch, Leaving a suitable gap from the edge.
turn the bag inside out again and trim the edges of your stitching as before.
Step 11: Finally
I use it to keep the ibook from getting scratched in my backpack / other bags.